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Titolo:
Coronal radiation and helium lambda 584 emission in active regions
Autore:
Fredvik, T; Maltby, P;
Indirizzi:
Univ Oslo, Inst Theoret Astrophys, N-0315 Oslo, Norway Univ Oslo Oslo Norway N-0315 Inst Theoret Astrophys, N-0315 Oslo, Norway
Titolo Testata:
SOLAR PHYSICS
fascicolo: 1, volume: 184, anno: 1999,
pagine: 113 - 132
SICI:
0038-0938(199901)184:1<113:CRAHL5>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSITION REGION; DIAGNOSTIC SPECTROMETER; SOLAR CHROMOSPHERE; LINE; TELESCOPE; FLOWS; SOHO;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Fredvik, T Univ Oslo, Inst Theoret Astrophys, N-0315 Oslo, Norway Univ Oslo Oslo Norway N-0315 t Astrophys, N-0315 Oslo, Norway
Citazione:
T. Fredvik e P. Maltby, "Coronal radiation and helium lambda 584 emission in active regions", SOLAR PHYS, 184(1), 1999, pp. 113-132

Abstract

Based on EUV observations of eleven sunspot regions obtained with the Coronal Diagnostic Spectrometer, CDS, on SOHO we have studied the spatial distribution, temporal variation and wavelength shift of the He I lambda 584 line. We find a relatively high spatial correlation between the coronal line Fe XVI lambda 360 and the He I lambda 584 line. This points to coronal back-radiation as an important contributor to the formation of the He I line in active regions. However, contribution to the line formation from another source is suggested by the following two findings: First, the red-shifted line profiles of both He I lambda 584 and the transition region lines tend to be more intense than blue-shifted profiles. Second, the He I lambda 584 emission changes significantly faster than the coronal line emission.

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Documento generato il 18/09/20 alle ore 16:54:19