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Observations of Chromospheric Flare Re-Brightenings


Miklenić, Christiane; Verong, Astrid; Vršnak, Bojan; Barta, Miroslav
Observations of Chromospheric Flare Re-Brightenings // The Astrophysical journal, 719 (2010), 1750-1758 doi:10.1088/0004-637X/719/2/1750 (međunarodna recenzija, članak, znanstveni)


Naslov
Observations of Chromospheric Flare Re-Brightenings

Autori
Miklenić, Christiane ; Verong, Astrid ; Vršnak, Bojan ; Barta, Miroslav

Izvornik
The Astrophysical journal (0004-637X) 719 (2010); 1750-1758

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Sun: activity – Sun: chromosphere – Sun: corona – Sun: flares

Sažetak
We investigate an active region that produced three C-class flares and one M-class flare within 2.5 hr. The morphology and location of the C-flares indicate that these events constitute a set of homologous flares. Radio observations indicate the occurrence of a downward-moving plasmoid during the impulsive phase of the M flare. We use TRACE 1700 Å filtergrams and SOHO Michelson Doppler Imager magnetograms to examine the character of the UV brightenings ; i.e., we search for re-brightenings of former flare areas both across the series of events and within one and the same event. We find that essentially the same footpoints re-brighten in each C flare. Based on the progression of both the derived magnetic flux change rate and the observed Radio Solar Telescope Network microwave emission, we speculate about a further re-brightening during the decay phase of the M flare as a further member of the series of homologous flares. We conclude that the “postflare” field is driven to repeated eruption by continuous, shear-increasing, horizontal, photospheric flows, as one end of the involved magnetic arcade is anchored in the penumbra of a large sunspot. The observed motion pattern of the UV kernels indicates that the arcade evolves during the series of events from a both highly sheared and heavily entangled state to a still sheared but more organized state.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
007-0000000-1362 - Eruptivni procesi u Sunčevoj atmosferi (Bojan Vršnak, )

Ustanove
Geodetski fakultet, Zagreb

Profili:

Avatar Url Bojan Vršnak (autor)

Citiraj ovu publikaciju

Miklenić, Christiane; Verong, Astrid; Vršnak, Bojan; Barta, Miroslav
Observations of Chromospheric Flare Re-Brightenings // The Astrophysical journal, 719 (2010), 1750-1758 doi:10.1088/0004-637X/719/2/1750 (međunarodna recenzija, članak, znanstveni)
Miklenić, C., Verong, A., Vršnak, B. & Barta, M. (2010) Observations of Chromospheric Flare Re-Brightenings. The Astrophysical journal, 719, 1750-1758 doi:10.1088/0004-637X/719/2/1750.
@article{article, year = {2010}, pages = {1750-1758}, DOI = {10.1088/0004-637X/719/2/1750}, keywords = {Sun: activity – Sun: chromosphere – Sun: corona – Sun: flares}, journal = {The Astrophysical journal}, doi = {10.1088/0004-637X/719/2/1750}, volume = {719}, issn = {0004-637X}, title = {Observations of Chromospheric Flare Re-Brightenings}, keyword = {Sun: activity – Sun: chromosphere – Sun: corona – Sun: flares} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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  • NASA ADS


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