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Meteorological Investigations of the Upper Atmosphere: Proceedings of the American Meteorological Society Symposium on Meteorological Investigations Above 70 Kilometers, Miami Beach, Florida, 31 May–2 June 1967 PDF

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METEOROLOGICAL MONOGRAPHS EDITOR J. MURRAY MITCHELL, JR. Environmental Data Service, ESSA ASSOCIATE EDITORS WERNER A. BAUM WALTER HITSCHFELD CHESTER W. NEWTON Environmental Science Services McGill University National Center for Atmospheric Administration Research GLENN R. HILST WILLIAM W. KELLOGG JEROME SPAR The Travelers Research Center National Center for Atmospheric New York University Research TECHNICAL EDITOR ASSISTANT TECHNICAL EDITOR JOHN R. GERHARDT CARMELA A. POCE American Meteorological Society American Meteorological Society • METEOROLOGICAL MONOGRAPHS, a serial publication of the American Meteorological Society, serves as a medium for orig· ina! papers, survey articles, and other material in meteorology and closely related fields; it is intended for material which is better suited in length or nature for publication in monograph form than for publication in the Journal of the Atmospheric Sciences, the Journal of Applied Meteorology, the Bulletin of the American Meteorological Society or Weatherwise. A METEOROLOGI CAL MONOGRAPH may consist of a single paper or of a group of papers concerned with a single general topic. • INFORMATION FOR CONTRIBUTORS Manuscripts for the METEOROLOGICAL MONO lined. Subsection headings, if needed, should be located at GRAPHS should be sent directly to Editor: Dr. J. Murray the beginning of certain paragraphs and underlined. Mitchell, Environmental Data Service, ESSA, Silver Spring, 7. References. References should be arranged alphabet Md. 20910. Manuscripts may be submitted by persons of ically without numbering. The text citation should consist any nationality who are members or nonmembers of the of the name of the author and the year of publication. Society, but only manuscripts in the English language can Thus, "according to Halley (1686)," or "as shown by an be accepted. Every manuscript submitted is reviewed and earlier study (Halley, 1686)." When there are two or more in no case does the editor advise the author as to acceptabil papers by the same author published in the same year, the ity until at least one review has been obtained. Authors will distinguishing letters, a, b, etc., should be added to the year. receive galley proof but not page proof. In the listing of references, each reference must be com Manuscripts. The manuscript must be complete and in plete and in the following form. For an article: author (s), final form when submitted. It must be original typewritten year, title of article, title of journal (abbreviated and under copy on one side only of white paper sheets 8Y2 X 11 inches, lined), volume number, pages. For a book: author (s), year, consecutively numbered; double spacing and wide margins title of book (underlined), city of publication, publisher, are essential. Carbon copy and single spacing are not ac pages. Abbreviations for journal titles should in general ceptable. conform to the "List of Periodicals" published by Chemical Abstracts. Each manuscript may include the following components, 8. Appendix. Essential material which is of interest to a which should be presented in the order listed. Of these, the limited group of readers should not be included in the main table of contents; title, author's name and affiliation; ab body of the text but should be presented in an appendix. It stract; text; references; and legends are obligatory. is sufficient to outline in the text the ideas, procedures, I. Title page. This will be prepared by the editor if the assumptions, etc., involved, and to refer the reader to the manuscript is accepted for publication. appendix for fuller details. For example, lengthy and in volved mathematical analyses are better placed in an ap 2. Preface or foreword. A preface may be contributed by pendix than in the main text. the sponsors of the investigation, or by some other interested group or individual. The preface should indicate the origin Illustrations. The illustrations should accompany the of the study and should present other facts of general interest manuscript and be in final form. Each figure should be which emphasize its importance and significance. mentioned specifically in the text. Figure number and leg end will be set in type and must not be part of the drawing. 3. Table of contents. Chapter, section, and subsection A separate list of legends should be provided. The following headings should all be listed in the table of contents. details should be observed: 4. Title, author's name and affiliation. The affiliation I. Drawings should be done entirely in black India ink. should be stated as concisely as possible and should not It is often desirable to submit photographic copies of original constitute a complete address. The date of receipt of the drawings, retaining the originals until the manuscript has manuscript is supplied by the editor. been accepted and is ready to go to the printer. If the draw 5. Abstract. This should summarize the principal hy ings are large, photographic copies should be no larger than potheses, methods, and conclusions of the investigation. It 81;2 X 11 inches to facilitate reviewing and editing. should not include mathematical symbols or references to 2. The width of a figure as printed is 3Ys inches or, less equation numbers, since the abstract is sometimes quoted frequently, 61;2 inches. Original drawings are preferably verbatim in abstracting or reviewing journals. about twice final size. 6. Text. For one of a group of papers which together 3. Lettering must be large enough to remain clearly legible constitute a MONOGRAPH, it is sufficient to divide the text when reduced; after reduction the smallest letters should not into sections, each with a separate heading, numbered con be less than lfl6 inch or I mm high. secutively. The section heading should be placed on a sepa Abbreviations and mathematical symbols. See inside covers rate line, flush with the margin, and should not be under- of the Journal of the Atmospheric Sciences. METEOROLOGICAL MONOGRAPHS Volume 9 April 1968 Number 31 METEOROLOGICAL INVESTIGATIONS OF THE UPPER ATMOSPHERE Proceedings of the American Meteorological Society Symposium on Meteorological Investigations Above 70 Kilometers, Miami Beach, Florida, 31 May-2 June 1967 Edited by R. S. Quiroz Sponsored by the AMS Committee on Atmospheric Problems of Aerospace Vehicles. This document was prepared with the support of the Aerospace En vironment Division, Marshall Space Flight Center, NASA, under Contract NA8-20473. PUBLISI-IED BY TI-lE AMERICAN METEOROLOGICAL SOCIETY 4 5 B E A C 0 N ST., B 0 S T 0 N , MASS. 0 2 I 0 8 AMERICAN METEOROLOGICAL SOCIETY PUBLICATIONS COMMISSION George W. Platzman, Chairman The University of Chicago Robert Jastrow, ex officio JOURNAL OF THE ATMOSPHERIC SCIENCES Gordon J. F. MacDonald, ex officio JOURNAL OF THE ATMOSPHERIC SCIENCES Richard J. Reed, ex officio JOURNAL OF APPLIED METEOROLOGY J. Murray Mitchell, Jr., ex officio METEOROLOGICAL MONOGRAPHS Malcolm Rigby, ex officio METEOROLOGICAL AND GEOASTROPHYSICAL ABSTRACTS David M. Ludlum, ex officio WEATHERWISE Richard M. Goody Harvard University James E. McDonald The University of Arizona Frederick Sanders Massachusetts Institute of Technology Kenneth C. Spengler, ex officio American Meteorological Society ISBN 978-1-935704-37-9 (eBook) DOI 10.1007/978-1-935704-37-9 LANCASTER PRESS, INC., LANCASTER, PA. TABLE OF CONTENTS PREFACE......................................................................... v PURPOSE OF THE SYMPOSIUM-B. N. CK\RLES ................................. . 1 PART 1. METEOROLOGICAL DATA REQUIREMENTS Session Chairman: RICHARD A. CRAIG, Florida State University, Tallahassee, Fla. RESEARCH ON THE LOWER FRINGE OF SPACE-W. W. KELLOGG.......... 2 AEROSPACE SYSTEMS REQUIREMENTS FOR ENVIRONMENTAL DATA IN THE ALTITUDE RANGE 60 TO 200 Km-NoRM~-\N SISSENWINE............. 7 PART 2: ENERGY SOURCES FOR METEOROLOGICAL PROCESSES Session Chairman: S. FRED SINGER, University of Miami; now Deputy Assistant Secre- tary for Water Pollution Control, U. S. Dept. of Interior SOLAR INFLUENCES AND THEIR VARIATIONS-]. B. GREGORY............. 19 REACTIONS RELATED TO ATMOSPHERIC OZONE CHEMISTRY-H. I. ScHIFF 32 LOWER ATMOSPHERIC ENERGY SOURCES FOR THE UPPER ATMOSPHERE -RICHARDS. LINDZEN...................................................... 37 PART 3. THE NEUTRAL ATMOSPHERE Session Chairmen: LUIGI G. ]ACCHIA, Smithsonian Astrophysical Observatory, Cam bridge, l\1ass.; and jACQUES E. BLAMONT, National Center of Scientific Research, Verrieres-le-Buisson, France COMPOSITION OF THE MESOSPHERE AND LOWER THERMOSPHERE- K. s. w. CHAMPION........................................................ 47 TEMPERATURE, DENSITY AND PRESSURE VARIATIONS IN THE STRATO- SPHERE AND THE MESOSPHERE-R. J. MURGATROYD.................... 57 THE STRUCTURE OF THE THERMOSPHERE AND ITS VARIATIONS-IsADORE HARRIS AND WoLFGANG PRIESTER............................................ 72 DENSITY AND TEMPERATURE VARIATIONS IN THE INTERVENING LAYER (90-150 Km)-GERHARD F. ScHILLING........................................ 82 A NUMERICAL STUDY OF THE VARIABLE STRUCTURE OF THE LOWER THERMOSPHERE-JAMES R. MAHONEY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 THE GENERAL CIRCULATION OF THE ATMOSPHERE ABOVE 60 Km-REGI- NALD E. NE\VELL........................................................... 98 TIDAL OSCILLATIONS, SHORTER PERIOD GRAVITY WAVES AND SHEAR WAVES-C. 0. HINES..................................................... 114 SOME OBSERVATIONS OF TURBULENCE IN THE 80 TO 110 Km REGION OF THE UPPER ATMOSPHERE-C. G. JusTus AND R. G. RoPER................ 122 PART 4. INTERACTION BETWEEN THE IONIZED AND NEUTRAL ATMOSPHERES Session Chairman: RoBERT W. KNECHT, Space Disturbances Laboratory, ESSA., Boulder, Colo. D-REGION PHENOMENA AND STRATOSPHERIC-MESOSPHERIC COUPLING -E. A. LAUTER AND K. SPRENGER........................................... 129 THE INFLUENCE OF THE NEUTRAL WIND FIELD ON THE DISTRIBUTION OF IONIZATION IN THE E-REGION-MALCOLM A. MACLEOD. . . . . . . . . . . . . . . 139 RELATIVE MOTION OF ION AND NEUTRAL CLOUDS-R. LusT............. 148 IONOSPHERIC WINDS AND ASSOCIATED GEOMAGNETIC VARIATIONS ::\I.\sAHis.\ SuGIURA......................................................... 152 111 lV METEOROLOGICAL MONOGRAPHS VoL. 8, No. 31 PART 5. MEASURING TECHNIQUES, ACCURACIES, AND BASIC RESULTS Session Chairman: MAURICE DuBIN, National Aeronautics and Space Administration, Washington, D. C. METEOROLOGICAL ROCKET MEASUREMENTS IN THE MESOSPHERE WILLis L. WEBB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158 GRENADE EXPERIMENTS IN A PROGRAM OF SYNOPTIC METEOROLOGICAL MEASUREMENTS-W. S. SMITH, L. B. KATCHEN AND J. S. THEON. . . . . . . . . . . . . 170 FALLING SPHERE MEASUREMENTS, 30 TO 120 Km-L. M. JoNEs AXD J. W. PETERSON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 6 WINDS AND DENSITIES FROM RADAR METEOR TRAIL RETURNS, 80 TO 120 Km-ARNOLD A. BARNES, ]R............................................. 190 TECHNIQUES AND PRECISIONS ASSOCIATED WITH CHEMICAL TRAIL MEASUREMENTS-E. R. MANRING AND J. F. BEDINGER...................... 196 RECENT MEASUREMENTS OF THE LOWER THERMOSPHERE STRUCTURE -N. w. SPENCER, G. R. CARIGNAN AND D. R. TAEUSCH........................ 201 SYSTEM FOR COLLECTING WORLDWIDE LOWER THERMOSPHERE DATA -FRANCIS S. JOHNSON. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208 PART 6. PANEL DISCUSSIONS PANEL 1: THE INFLUENCE OF LOWER BOUNDARY CONDITIONS ON THERMO SPHERIC MODELS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213 Moderator: FRANCis S. JOHNSON Summary: GARY E. THOMAS PANEL 2: THEORETICAL APPROACHES TO THE PROBLEMS OF THE NEU TRAL ATMOSPHERE............................................. 215 Moderator: CoLIN 0. HINES Summary: W. W. KELLOGG PANEL 3: DEDUCING THE STRUCTURE AND CIRCULATION OF THE NEU TRAL COMPONENT IN IONIZED LAYERS....................... 218 Moderator : ADAM KocHANSKI Summary: J. W. WRIGHT PANEL 4: SPECIAL PROBLEMS OF MEASUREMENT BELOW 100 Km....... 222 Moderator: WILLIAM NORDBERG Summary: WILLIAM W. HILDRETH PANEL 5: SPECIAL PROBLEMS OF MEASUREMENT IN THE REGION 100 TO 200 Km. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225 Moderator: HANS E. HINTEREGGER Summary: WILLIAM D. KLEIS PANEL 6: PARTICULATE MATTER IN THE REGION 70 TO 100 Km........ 228 Moderator: S. F. SINGER Summary: LoTHAR ~T. BANDERMANN INDEX........................................................................... 230 PREFACE It seems to be a mark of our times that science is The next four sessions traced our present knowledge furthered through practical necessity. It was the of the high atmosphere, beginning with the local intent of the American Meteorological Society's absorption of variable solar radiation and the energy Committee on Atmospheric Problems of Aerospace exhange between layers, and proceeding to a detailed Vehicles to set the scene, at l\liami Beach, Florida, for description of the neutral structure and its interaction effective communication between atmospheric scien with the ionized component. In the observational tists and engineers with problems involving the high sessions (6-7) particular attention v.·as given to the atmosphere. The engineers would describe their pro measurements needed to remedy deficiencies in our blems and the assembled geophysical scientists would knowledge of the high atmosphere. Interspersed tell what they knew about the atmosphere that was among the sessions were six panel discussions of special relevant to these problems. After months of planning, problem areas. These were tape-recorded, and sum it became apparent to the Program Committee, maries prepared with the aid of the transcripts are headed by Dr. Sidney Teweles, that the symposium included in this monograph along with the 24 major would be strongly weighted in favor of reviews of papers presented. For convenience, the panel discus current scientific knowledge of the upper atmosphere, sion summaries are placed together at the end of the with less attention to the engineering problems which monograph. gave rise to the symposium. More time would be A word should be said about the a! ti tude limits in given to discussions of theoretical and observational the title of sessions 3-4 and in the title of the sym investigations of the atmosphere itself than to the posium. Knowledge of the very high atmosphere has question of interaction between aerospace vehicles progressed at a great rate, owing largely to the wealth and the atmosphere. of information deduced from satellite orbital decelera This turn of events, however, was felicitous in tions above 1 SO km. Much also has been learned from several ways. The symposium provided an unprece meteorological rocket measurements extending, in the dented degree of communication among atmospheric main, from radiosonde levels up to 60 or 70 km. The scientists of different backgrounds, but primarily intervening region (70-150 km), comprising the upper between meteorologists who have worked mainly in mesosphere and lower thermosphere, has been inade the lower or middle atmosphere on the one hand, and quately observed and is still inadequately understood. ionospheric physicists, aeronomers and astronomers This region, which is extraordinarily complex, will concerned with higher altitudes, on the other. Strongly doubtless continue to challenge both observers and evident also was a reciprocal respect for the problems theoreticians for some time. Indeed, even some of the of experimenters and theoreticians. These two factors derived knowledge of the atmospheric structure above alone distinguished the symposium from other scien this region has been placed in a less secure light by the tific meetings of recent years dealing with the upper realization of recent years that variability near the atmosphere. base of the thermosphere may influence the model The symposium format was logically conceived. results for higher altitudes. This can be surmised from the progression of the With these thoughts and with the awareness of certain atmospheric problems for aerospace vehicles titles of the sessions, repeated below: at sub-orbital altitudes, the Program Committee Session 1. lVIeteorological Data Requirements conceived an array of topics concerned primarily with Session 2. Energy Sources for Meteorological the region 70 to 150 km. An outstanding authority Processes from the United States or abroad was invited to cover Sessions 3-4. The Neutral Atmosphere, 70-200 km each of the topics. The response was highly gratifying, Session 5. Interaction Between the Ionized and as attested by the representation in this monograph. Neutral Atmospheres Since the atmospheric structure above 150 km is Sessions 6-7. Measuring Techniques, Accuracies closely dependent on boundary conditions at some and Basic Results lower level, the more general title chosen for the monograph, Meteorological Investigations of the Upper In the first session surveys of observational data Atmosphere, seems wholly appropriate. needs were presented from the special viewpoints of A word of explanation, also, should be given con the atmospheric scientist and the aerospace engineer. cerning a few changes from the symposium program v VI METEOROLOGICAL MONOGRAPHS VoL. 8, No. 31 published in the Bulletin of the American Meteorological Sidney Teweles and l\Ir. William Vaughan, the latter Society (Vol. 48, pp. 210-218). Following a suggestion a former Chairman of the Committee on Atmospheric by Dr. S. Fred Singer, a sixth panel discussion was Problems of Aerospace Vehicles. added to the five originally planned, dealing with a R. S. QGIROZ subject of lively interest, particulate material in the Editor region 70--100 km. This addition in some measure compensated for the last-minute omission of a paper on aerosol layers at the mesopause, to be given by AMS Committee on Atmospheric Problems of Dr. Georg Witt, of the University of Stockholm, who Aerospace Vehicles1 because of illness could not be present at the sym BERNARD N. CHARLES, Aerospace Corp., posium. And for more thorough coverage, two papers Chairman, 1967 actually presented earlier in the year in New York C. EuGENE BuELL, Kaman Nuclear City by Sugiura and Barnes have been included in WILLIAM W. ELAM, Bellcomm Inc. this monograph. WILLIAM W. HILDRETH, ]R., Douglas Aircraft Co. Thanks are due to the many persons who helped to ELMAR R. REITER, Colorado State Univ. make this monograph possible. Assistance in reviewing NORMAN SISSENWINE, AFCRL the manuscripts was received from A. Kochanski, H. M. Woolf, W. D. Kleis, J. Giraytys, A. J. Miller, SIDNEY TEWELES, ESSA w. W. R. Jeffries, W. S. Smith and R. E. Dickinson. The WILLIAM VAUGHAN, NASA editor deeply appreciates the encouragement of Dr. 1 Membership at time of Symposium. PURPOSE OF THE SYMPOSIUM B. N. CHARLES1 Aerospace Corporation, El Segundo, Calif. Broadly stated, the purpose of this symposium is to These considerations prompted the initiative of the facilitate the free exchange of scientific information A:VIS Committee on Atmospheric Problems o( Aero about the upper atmosphere. This conforms to one of space Vehicles in arranging this symposium. Our the prime objectives of the American Meteorological specific purpose is the convening of a cross-disciplinary Society-the "development and dissemination of seminar at which scientists and technologists can knowledge of meteorology in all its phases and exchange information and views, and identify those applications." A wealth of scientific experience has areas of mutual interest wherein increased coordina proven that such exchanges inspire new findings, gene tion of effort might accelerate progress in understand rate new concepts, and refresh and stimulate the ing of the atmosphere above 70 km, and in application seekers of new knowledge and those who apply such of such new technical capital to pragmatic purposes. knowledge in the service of society. In recent years we have witnessed a convergence of But in an era of such proliferation of scientific interest of and effort by meteorologists and aero information as to cause concern, why this subject, at nomers, in studies of the upper atmosphere. In a sense, this time, and why the effort to assemble such a we are here suggesting that a similar community of distinguished roster of participants? interest exists for scientists and engineers concerned One aspect of the remarkable rapid advances in with the same medium, and that a similar convergence aerospace technology that we have been privileged to of interest and effort may also be rewarding. witness during the past decade has been the recurring The approach adopted by the Program Committee, need to design and operate vehicles in environments under Dr. Teweles' leadership, begins with comprehen that are inadequately understood. The upper atmo sive reviews of the state of knowledge of the meso sphere is one such environment, and the paucity of sphere and lower thermosphere. These are to be supple needed design information has undoubtedly levied mented by panel discussions intended to illuminate substantial penalties in decreased systems perfor the more significant deficiencies in knowledge, con mance, increased costs, and delayed implementation sidering scientific and engineering needs, and which, of innovations that could contribute significantly to a hopefully, will further identify specific avenues for broad spectrum of social goals, including those of increased coordination of investigative efforts. scientific investigation. It is my pleasure and privilege to express apprecia For a more detailed exposition of these matters, I tion to the distinguished contributors to the program, commend to you the article by Dr. Sidney Teweles, in to the program committee that labored so effectively, the Bulletin of the American Meteorological Society of to the National Science Foundation for enabling the April 1967, in which the opinion is expressed that participation of our colleagues from overseas, to the increased coordination of scientific and technological National Aeronautics and Space Administration for effort is needed in upper atmospheric investigations. extending support for the publication of these pro ceedings, and to those in the audience for valued 1 Chairman, AMS Committee on Atmospheric Problems of Aerospace Vehicles. participation. 1 2 METEOROLOGICAL MONOGRAPHS VoL. 8, No. 31 RESEARCH ON THE LOWER FRINGE OF SPACE W. W. KELLOGG National Center for Atmospheric Research, Boulder, Colo. ABSTRACT There are at least three main areas of active research in the region of the atmosphere directly accessible only to sounding rockets: interactions between the motions of the neutral atmosphere and the ionized por tion; interactions, both by dynamic processes and by radiative transfer, between the upper and lower atmo sphere; and refinement of indirect probing techniques which can be used to study this region from the grou_nd or from satellites. Recent advances in these subjects have interesting practical implications as well as addmg to our still incomplete knowledge of this part of the "fringe of space." 1. Atmospheric problems All of these questions are of the sort that meteor ologists are more or less equipped to think about, but Meteorologists have a growing concern about the it is also becoming clear that the ionized part of the upper atmosphere for two main reasons. In the first upper atmosphere, and the physical and chemical re place, they are being asked to predict conditions above actions that take place there, are going to have to be the level where their rawinsonde balloons normally considered as well in any considerations of the dy operate, from 30 km on out to the fringe of space. In namics, and vice versa. It is no longer remarkable, but the second place, there is a growing awareness of the inevitable, that this AlVIS meeting has a session on need to learn more about the upper atmosphere be the interactions between the neutral and ionized por cause of its effect on the lower atmosphere; the atmo tions of the upper atmosphere. And it will be noted sphere, they realize, behaves as one complex system, that the aeronomists and ionospheric physicists at and is influenced by what takes place on the sun and in their meetings pay attention to the motions of the the space around the earth. neutral atmosphere more than they used to, and the In trying to understand the upper atmosphere we term used in 1957 by Walter Dieminger, of the Max are faced with a number of challenging questions, and Planck Institute for Ionospheric Physics, to describe usually not enough observations or theoretical knowl this area of research is more apt than ever: The edge to answer them. The main thrust of our studies meteorology of the ionosphere. \Vith meteorological rockets and certain indirect However, in order not to get off on too many tan methods has been to describe its complex motions. gents, I will refrain in this paper from discussing many Observations of these have been more available than aspects of ionospheric meteorology that are pertinent, temperature observations, and the average picture of such as the morphology of a magnetic storm, the the motions of the upper atmosphere has now been current systems in the lower ionosphere generated by sketched in quite well up to 60 or 70 km and more winds, and so forth. Some of these will be dealt with roughly to above 150 km. But the variations from the by other speakers. average: Ah, there's the rub! In the course of this meeting, there will be a number A second general class of questions concerns the of papers giving the latest information on the average sources of energy and momentum to account for the conditions, or "climatology," of the mesosphere and upper atmosphere motions. Such sources or exchanges lower thermosphere, so this subject will be treated of energy and momentum cannot be determined di onlv very briefly here. The average conditions at rectly, but are derived from wind and temperature middle latitudes, as is now well recognized, are measurements where possible. Closely related to both generally west winds in winter and east winds in of these questions, but particularly to the question of summer above 30 km, but at 90-100 km there is a energy and momentum transfer, is the general question reversal in these mean winds so that they are east in already referred to concerning how the upper atmo winter and west in summer, with a strong semiannual sphere relates to the lower atmosphere. These fasci variation also present above 90 km. The reason for nating interactions are only dimly understood, and this reversal is, as can be seen from the application of they will be discussed further below. the thermal wind equation, a reversal of the horizontal

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