Relationship between a spot and a filament observed during spacelab 2 mission
| dc.contributor.author | Schmieder, B. | en |
| dc.contributor.author | Dere, K. P. | en |
| dc.contributor.author | Raadu, M. A. | en |
| dc.contributor.author | D?moulin, P. | en |
| dc.contributor.author | Alissandrakis, C. E. | en |
| dc.date.accessioned | 2015-11-24T18:37:54Z | |
| dc.date.available | 2015-11-24T18:37:54Z | |
| dc.identifier.issn | 0273-1177 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/17244 | |
| dc.rights | Default Licence | - |
| dc.title | Relationship between a spot and a filament observed during spacelab 2 mission | en |
| heal.abstract | During the Spacelab 2 Mission, an active region including a sunspot, plages, fibrils and a filament which disappears during the observation period, was observed in Hα and in the C IV lines. The analysis of the observations leads to several conclusions. Shear in the active region filament is observed before its disappearance. Hα and C IV upflows in the filament are well correlated spatially, but the transition zone (C IV) velocities are an order of magnitude larger than the Hα chromospheric ones. Over the sunspot, the reverse-Evershed effect is observed in Hα and in C IV Dopplershift images while strong downflows are also detected in the C IV profiles. Magnetograph data for the whole region are used to calculate the linear force-free magnetic field. A single value of the force-free parameter α is found to give a good fit to both the sheared filament structure and the sunspot spiral structures, indicating a causal relationship. We propose a model based on the inductive coupling between current systems associated with the filament and the sunspot. Relaxation phenomena due to resistive effects in the filament could lead to irreversible conversion of magnetic energy into kinetic energy and heating. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | http://dx.doi.org/10.1016/0273-1177(90)90228-R | - |
| heal.identifier.secondary | http://www.sciencedirect.com/science/article/pii/027311779090228R | - |
| heal.journalName | Advances in Space Research | en |
| heal.journalType | peer reviewed | - |
| heal.publicationDate | 1990 | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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