Solar coronal heating from small-scale magnetic braids
| Autor: | L. P. Chitta, H. Peter, S. Parenti, D. Berghmans, F. Auchère, S. K. Solanki, R. Aznar Cuadrado, U. Schühle, L. Teriaca, S. Mandal, K. Barczynski, É. Buchlin, L. Harra, E. Kraaikamp, D. M. Long, L. Rodriguez, C. Schwanitz, P. J. Smith, C. Verbeeck, A. N. Zhukov, W. Liu, M. C. M. Cheung |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Sun: corona
corona Sun: magnetic fields magnetic reconnection plasmas [Sun] FOS: Physical sciences Astronomy and Astrophysics plasmas Space Physics (physics.space-ph) Physics - Plasma Physics Plasma Physics (physics.plasm-ph) Astrophysics - Solar and Stellar Astrophysics Physics - Space Physics Space and Planetary Science Solar and Stellar Astrophysics (astro-ph.SR) |
| Zdroj: | Astronomy & Astrophysics, 667 |
| ISSN: | 0004-6361 1432-0746 |
| DOI: | 10.3929/ethz-b-000589558 |
| Popis: | Relaxation of braided coronal magnetic fields through reconnection is thought to be a source of energy to heat plasma in active region coronal loops. However, observations of active region coronal heating associated with an untangling of magnetic braids remain sparse. One reason for this paucity could be the lack of coronal observations with a sufficiently high spatial and temporal resolution to capture this process in action. Using new observations with high spatial resolution (250-270 km on the Sun) and high cadence (3-10 s) from the Extreme Ultraviolet Imager (EUI) on board Solar Orbiter, we observed the untangling of small-scale coronal braids in different active regions. The untangling is associated with impulsive heating of the gas in these braided loops. We assess that coronal magnetic braids overlying cooler chromospheric filamentary structures are perhaps more common. Furthermore, our observations show signatures of spatially coherent and intermittent coronal heating during the relaxation of the magnetic braids. Our study reveals the operation of gentle and impulsive modes of magnetic reconnection in the solar corona. Astronomy & Astrophysics, 667 ISSN:0004-6361 ISSN:1432-0746 |
| Databáze: | OpenAIRE |
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