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Studying Magnetic Reconnection through Explosive Events in the Sun
Hannah Alpert
Explosive Events in Transition Region
• Transition region: Sun’s atmosphere between the chromosphere and the corona– 20,000–250,000 K
• EEs: spontaneous energy release, detected by broadening of spectral lines
Interface Region Imaging Spectrograph (IRIS) Data
Raster•Spectral data
SJI•Image of Sun
Identifying Explosive Events
Making Movies!
Classifying the EEs
• Spectrum– Red– Blue– Both– Alternating– Sheared
• Morphology– Compact– Loop– Footpoint– Complicated
Loop:
Compact:
Red:
Sheared:
Classifying the EEs: ExamplesSpectral Examples Morphology Examples
Plotting the Spectra (Si IV)
Velocity (km/s)
Analyzing the Data: Asymmetry
Red and blue quartiles for each of the 82 EEs from 2014-04-15
Analyzing the Data: Velocity and Classifications
Velocities of EEs from 2014-04-15
Comparing EE TypesAlternating events overplotted on entire data sets from 2014-04-15 and 16
Comparing EE TypesCompact events overplotted on entire data sets from 2014-04-15 and 16
Cumulative HistogramsEntire data sets from 2014-04-15 and 16
Issues and Future Work
• Analyze the histograms• Kolmogorov-Smirnov Test to compare
different EE types• More data!!• Examine complicated EEs (velocities, time
scales, spatial scales)• Relationship to magnetic fields and
reconnection