EUV arcades: Signatures of filament instability
Identifieur interne : 005687 ( Main/Exploration ); précédent : 005686; suivant : 005688EUV arcades: Signatures of filament instability
Auteurs : E. J. Schmahl [États-Unis] ; Z. Mouradian [France] ; M. J. Martres [France] ; I. Soru-Escaut [France]Source :
- Solar Physics [ 0038-0938 ] ; 1982-11-01.
Abstract
Abstract: We have examined seven active regions of the Skylab period in the EUV (Harvard College Observatory), and in Hα and K3 (Observatoire de Meudon, spectroheliograms and patrols) in order to elucidate the magnetic geometry in the coronal environment of filaments. We have also looked for signatures of magnetic reconfigurations associated with instabilities (i.e. velocities or disappearances) of filaments. Out of sixteen Hα filaments observed, six were stable (lifetime ≥ 48h). All the filaments lay within coronal cavities as seen in lines formed above 1.5 × 106 K (Mgx λ625, Sixii λ521, Fexvi λ417, Fexv λ361). None of the stable filaments had arcades or arches spanning the cavities except (sometimes) at the ends of the filaments. On the other hand, most (8/10) of the unstable filaments (having concurrent Doppler shifts or a subsequent DB within 24h) had arcades or single arches spanning their cavities. The arches were observed in EUV lines with formation temperatures as low as 2–4 × 105 K (Oiv λ554, Ovi λ1032, Ne vii λ465), as well as in hotter lines. A statistical test shows that the arcade/instability vs non-arcade/stability association is significant at the 99% confidence level. We suggest 2 types of scenario relating arcades to instabilities. The more preferable scenario is closely related to the Kuperus/Van Tend model of filament disruptions.
Url:
DOI: 10.1007/BF00151983
Affiliations:
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We have also looked for signatures of magnetic reconfigurations associated with instabilities (i.e. velocities or disappearances) of filaments. Out of sixteen Hα filaments observed, six were stable (lifetime ≥ 48h). All the filaments lay within coronal cavities as seen in lines formed above 1.5 × 106 K (Mgx λ625, Sixii λ521, Fexvi λ417, Fexv λ361). None of the stable filaments had arcades or arches spanning the cavities except (sometimes) at the ends of the filaments. On the other hand, most (8/10) of the unstable filaments (having concurrent Doppler shifts or a subsequent DB within 24h) had arcades or single arches spanning their cavities. The arches were observed in EUV lines with formation temperatures as low as 2–4 × 105 K (Oiv λ554, Ovi λ1032, Ne vii λ465), as well as in hotter lines. A statistical test shows that the arcade/instability vs non-arcade/stability association is significant at the 99% confidence level. We suggest 2 types of scenario relating arcades to instabilities. The more preferable scenario is closely related to the Kuperus/Van Tend model of filament disruptions.</div></front></TEI><affiliations><list><country><li>France</li><li>États-Unis</li></country><region><li>Maryland</li><li>Île-de-France</li></region><settlement><li>College Park (Maryland)</li><li>Meudon</li></settlement><orgName><li>Université du Maryland</li></orgName></list><tree><country name="États-Unis"><region name="Maryland"><name sortKey="Schmahl, E J" sort="Schmahl, E J" uniqKey="Schmahl E" first="E. J." last="Schmahl">E. J. Schmahl</name></region></country><country name="France"><region name="Île-de-France"><name sortKey="Mouradian, Z" sort="Mouradian, Z" uniqKey="Mouradian Z" first="Z." last="Mouradian">Z. Mouradian</name></region><name sortKey="Martres, M J" sort="Martres, M J" uniqKey="Martres M" first="M. J." last="Martres">M. J. Martres</name><name sortKey="Soru Escaut, I" sort="Soru Escaut, I" uniqKey="Soru Escaut I" first="I." last="Soru-Escaut">I. 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