NASA Technical Reports Server (NTRS) 20160000709: Analysis of Inter-Moss Loops in the Solar Region with IRIS and SDO AIA: Automatic Event Detection and Characterization

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Analysis of Inter-moss Loops in the Solar Region with IRIS and SDO/AIA: Automa>c Event Detec>on and Characteriza>on
Brian Fayock1, Amy Winebarger2, Bart De Pon>eu3, Caroline Alexander2
1 Center for Space Plasma and Aeronomic Research, Space Science Department, University of Alabama in Huntsville
2 NASA’s Marshall Space Flight Center, Huntsville, Alabama
3 Lockheed Mar>n Solar and Astrophysics Laboratory , Palo Alto, California
Light Curve Analysis, Event Detec>on, and Comparison Between IRIS SJ1400, AIA 171, AIA 193, and AIA 211
Background Conclusions
The Interface Region Imaging Spectrograph (IRIS), launched in the For the IRIS data set, the algorithms outlined here have found more
summer of 2013, is designed specifically to observe and investigate than a 50 million events, resulting in more than 400,000 groups. For
the transition region and adjacent layers of the solar atmosphere, the purpose of only finding inter-moss loops, these results would be
obtaining images in high spatial, temporal, and spectral resolution. considered a bit extreme. However, by setting a very low standard
for the qualifications of an event, we have collected a valuable set
Our particular work is focused on the evolution of inter-moss loops,
of statistics that can potentially be used to define the events that we
which have been detected in the lower corona by the Atmospheric
want. Two examples of these statistics are shown just below.
Imaging Assembly (AIA) and the High-Resolution Coronal Imager (Hi-

C), but are known to have foot points below the transition region. In the first figure below, the majority of the groups are small and
With the high-resolution capabilities of IRIS and its Si IV pass band, short-lived, while the largest few are likely to be grouped too
which measures activity in the upper chromosphere, we can study generously due to complex activity within the region. Minus these
these magnetic loops in detail and compare their characteristic length top few, the larger groups are most likely associated with the inter-
and time scales to those obtained from several AIA image sets, Top Row: Progress Data - Start, Peak, End BoZom Row: Group Data - one group = one color moss loops that we had set out to find. In the lower figure, we can
particularly the 171, 193, and 211 pass bands. By comparing the see some type of division between two general types of groups for
results between these four data sets, one can potentially establish a durations below or above ~12 pixels or ~124 seconds in time.
measure of the ionization equilibrium for the location in question.
The progress of this work is currently involved in the automatic
To explore this idea, we found a large, sit-and-stare observation within characterization of groups and how comparisons between these
the IRIS database that fit our specifications. This data set contained a four data sets can lead to an interpretation of the local state of
number of well-defined inter-moss loops (by visual inspection) with a ionization. The automatic characterization will need to include a
cadence less than or equal to that of AIA (~12 seconds). This variety of special cases given the complex nature of all structures
particular data set was recorded on October 23, 2013 at 07:09:30, seen within the results. One particular issue is the likelihood of the
lasting for 3219 seconds with a field of view of 120.6 by 128.1 appearance of events in the IRIS data before or after an event is
arcseconds, centered on -53.9 by 59.1 arcseconds from disk center. seen in all three AIA data sets. This is one of the criteria that would
For ease of comparison, the AIA data has been interpolated to match be able to characterize the level of ionization. If interested, see lead
the IRIS cadence and resolution. author for more examples from this data set.

In the main portion of the poster, we demonstrate the detection of This work is funded by a cooperative agreement between the NASA
events, the information collected, and the immediate results to the IRIS SJ 1400 AIA 171 AIA 193 AIA 211 Marshall Space Flight Center and the Center for Space Plasma and
right, showing the progress of an event with green as the start, blue as Aeronomic Research at the University of Alabama in Huntsville.
the peak, and red as the end. Below here, we demonstrate how pixels
are combined to form groups. The 3D results are shown to the right. Statistical Results
Grouping Demonstration
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