Abstract
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).
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Acknowledgements
We acknowledge Craig DeForest and Ewa Chmielewska for valuable suggestions and comments. MS acknowledges financial support from the Polish National Science Centre grant 2015/19/B/ST9/02826. This material is based upon work supported by the National Center for Atmospheric Research, which is a major facility sponsored by the National Science Foundation under Cooperative Agreement No. 1852977.
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Ba̧k-Stȩślicka, U., Gibson, S.E. & Stȩślicki, M. Thermal Properties of Coronal Cavities. Sol Phys 294, 164 (2019). https://doi.org/10.1007/s11207-019-1554-z
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DOI: https://doi.org/10.1007/s11207-019-1554-z