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Titolo:
Magnetic field evolution leading to solar flares I. Cases with low magnetic shear and flux emergence
Autore:
Li, H; Sakurai, T; Ichimoto, K; UeNo, S;
Indirizzi:
Chinese Acad Sci, Natl Astron Observ, Purple Mt Observ, Nanjing 210008, Peoples R China Chinese Acad Sci Nanjing Peoples R China 210008 210008, Peoples R China Natl Astron Observ, Mitaka, Tokyo 1818588, Japan Natl Astron Observ Mitaka Tokyo Japan 1818588 itaka, Tokyo 1818588, Japan Kyoto Univ, Hida Observ, Gifu 5061317, Japan Kyoto Univ Gifu Japan 5061317 oto Univ, Hida Observ, Gifu 5061317, Japan
Titolo Testata:
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
fascicolo: 3, volume: 52, anno: 2000,
pagine: 465 - 481
SICI:
0004-6264(2000)52:3<465:MFELTS>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY TELESCOPE; A MISSION; MULTIWAVELENGTH OBSERVATIONS; ACTIVE REGIONS; RECONNECTION; CONFIGURATION; CURRENTS; TOPOLOGY; SYSTEM; SITES;
Keywords:
Sun : flares; Sun : magnetic fields; Sun : X-rays;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Li, H Chinese Acad Sci, Natl Astron Observ, Purple Mt Observ, 2 W Beijing Rd, Nanjing 210008, Peoples R China Chinese Acad Sci 2 W Beijing Rd Nanjing Peoples R China 210008 hina
Citazione:
H. Li et al., "Magnetic field evolution leading to solar flares I. Cases with low magnetic shear and flux emergence", PUB AST S J, 52(3), 2000, pp. 465-481

Abstract

We picked up five solar flares larger than GOES X-ray class M/H alpha importance 1, and studied the magnetic evolution of the corresponding active regions. In particular, we investigated the spatial relationships among H alpha flare ribbons, soft X-ray (SXR) hare loops, and magnetic configurations. Our results show that all of these flares are not associated with high magnetic shear, but with emerging flux, indicating that flux emergence is a common phenomenon in this kind of solar flare with low magnetic shear. The maximum values of the transverse magnetic fields on the neutral lines responsible for these hares are 300-800 G. All of these flares but one have multiple (more than two) H alpha ribbons, and almost all of these ribbons are located at the footpoints of SXR flare loops. The flare-related shear changes,which can be both positive and negative, may be determined by the balance of the energy carried by the emerging flux and that required to power the flare.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 09:09:13