Ultraviolet Events Observed in Active Regions. II. An Interpretation of Flaring Arches and Associated Small Flares
| Autor: | M. G. Rovira, J. Fontenla, Einar Tandberg-Hanssen |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Physics
Solar flare Astrophysics::High Energy Astrophysical Phenomena Joule effect Astronomy Astronomy and Astrophysics Astrophysics Plasma Solar maximum law.invention Space and Planetary Science law Physics::Space Physics Astrophysics::Solar and Stellar Astrophysics Electric current Arch Pressure gradient Flare |
| Zdroj: | The Astrophysical Journal. 491:925-932 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/304970 |
| Popis: | We analyze Hα, UV, and X-ray emissions in and around the spectacular arch system seen in the corona on 1980 March 27 during the Solar Maximum Mission. The flaring of the arch plasma is studied, and its dependence on triggering mechanisms related to the observed small limb flare in the arch footpoint is analyzed. To drive these events, we propose a mechanism in which small electric current circuits and the localized magnetic free energy are continuously generated at a magnetic null by a pressure gradient, which then compress or expand the plasma. This free energy dissipates by Joule effect and upward transport. |
| Databáze: | OpenAIRE |
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