Thermal Properties of Coronal Cavities

We have analyzed 33 cavities observed between 2012 and 2018, from solar activity maximum to minimum. For each cavity we applied a differential emission measure method to obtain both a temperature distribution and a value of the average temperature. We find that cavities are filled with material hott...

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Bibliographic Details
Published in:Solar physics 2019-11, Vol.294 (11), p.1-14, Article 164
Main Authors: Ba̧k-Stȩślicka, Urszula, Gibson, Sarah E., Stȩślicki, Marek
Format: Article
Language:English
Subjects:
Astrophysics and Astroparticles
Atmospheric Sciences
Differential thermal analysis
Emission measurements
Holes
Physics
Physics and Astronomy
Solar activity
Solar cycle
Solar maximum
Solar minimum
Solar physics
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Temperature distribution
Thermal properties
Thermodynamic properties
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Summary:We have analyzed 33 cavities observed between 2012 and 2018, from solar activity maximum to minimum. For each cavity we applied a differential emission measure method to obtain both a temperature distribution and a value of the average temperature. We find that cavities are filled with material hotter than the surrounding streamer, with temperatures in the range of 1.67 – 2.15 MK. Differences between temperatures of cavities and surrounding streamers are in the range of 0.11 – 0.32 MK with an average value of 0.21 MK. We found that temperatures of both, cavities and streamers, vary as a function of different phases of solar activity. During solar maximum the structures are slightly hotter than those observed during solar minimum (1.85 – 2.15 MK vs. 1.67 – 1.88 MK for cavities and streamers, respectively).
ISSN:0038-0938
1573-093X
DOI:10.1007/s11207-019-1554-z