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Titolo:
TEMPORAL CORRELATION OF SOLAR HARD X-RAY-BURSTS WITH CHROMOSPHERIC EVAPORATION
Autore:
PLUNKETT SP; SIMNETT GM;
Indirizzi:
UNIV BIRMINGHAM,SCH PHYS & SPACE RES BIRMINGHAM B15 2TT W MIDLANDS ENGLAND
Titolo Testata:
Solar physics
fascicolo: 2, volume: 155, anno: 1994,
pagine: 351 - 371
SICI:
0038-0938(1994)155:2<351:TCOSHX>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
BRAGG CRYSTAL SPECTROMETER; IMPULSIVE PHASE; FLARES; ELECTRONS; YOHKOH; PROTONS; MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
S.P. Plunkett e G.M. Simnett, "TEMPORAL CORRELATION OF SOLAR HARD X-RAY-BURSTS WITH CHROMOSPHERIC EVAPORATION", Solar physics, 155(2), 1994, pp. 351-371

Abstract

During the impulsive phase of many solar flares, blueshifted emissionwings are observed on the soft X-ray spectral lines of highly excitedions that are produced in the flare plasma. This emission has been commonly interpreted as chromospheric evaporation of material from the footpoints of coronal loops by non-thermal particle beams, although thequestion of whether the bulk of the energy is carried by electrons orions (protons) has been the subject of much debate. The precise temporal relationship between the onsets of the blueshifted emission and the hard X-ray bursts is particularly important in resolving the mechanism of energy transfer to the hot plasma in the impulsive phase. A sample of flares observed with the Bragg Crystal Spectrometer (BCS) on Yohkoh has been analysed for blueshifted emission and the results compared with hard X-ray light curves obtained with the Burst and Transient Source Experiment (BATSE) on the Compton Gamma Ray Observatory (CGRO). In some flares, the blueshifted emission precedes the onset of the hard X-rays by up to 100 s. There is no evidence for a temporal correlation between the maximum energy input to the hard X-ray bursts and the maximum blueshifted intensity. These results lend support to those models favouring protons as the dominant energy carrier in the impulsive phase of hares and are inconsistent with the hypothesis that the bulk of the energy resides in electron beams, although some other energy input, while unlikely, cannot be completely eliminated.

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Documento generato il 22/10/20 alle ore 08:07:18