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Titolo:
SIMULTANEOUS ULTRAVIOLET AND X-RAY OBSERVATIONS OF SOLAR MICROFLARES
Autore:
PORTER JG; FONTENLA JM; SIMNETT GM;
Indirizzi:
NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,ES 82 HUNTSVILLE AL 35812 UNIV ALABAMA,CSPAR HUNTSVILLE AL 35899 UNIV BIRMINGHAM,DEPT PHYS & SPACE RES BIRMINGHAM B15 2TT W MIDLANDS ENGLAND
Titolo Testata:
The Astrophysical journal
fascicolo: 1, volume: 438, anno: 1995,
parte:, 1
pagine: 472 - 479
SICI:
0004-637X(1995)438:1<472:SUAXOO>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACTIVE REGION; MAXIMUM MISSION; FLARES; BURSTS; EMISSION; OSO-8; BRIGHTENINGS; SPECTROMETER; UV;
Keywords:
SUN, FLARES; SUN, UV RADIATION; SUN, X-RAYS, GAMMA RAYS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
47
Recensione:
Indirizzi per estratti:
Citazione:
J.G. Porter et al., "SIMULTANEOUS ULTRAVIOLET AND X-RAY OBSERVATIONS OF SOLAR MICROFLARES", The Astrophysical journal, 438(1), 1995, pp. 472-479

Abstract

We present a comparison of observations of a solar active region obtained with the Ultraviolet Spectrometer and Polarimeter (UVSP) and the Hard X-ray Imaging Spectrometer (HXIS) on board the Solar Maximum Mission (SMM). The data show many subflares and smaller events during a 9 hr period in which there were no major flares. This activity is associated with areas of complex, evolving magnetic fields. Events substantially smaller than subflares, identified in C IV 1548 angstrom emission(T = 10(5) K), are found to have impulsive counterparts in 3.5-5.5 keV X-ray emission characteristic of T approximately 10(7) K. These ''microflares'' are therefore true members of the flare family, reaching temperatures greater than that of the ambient solar corona. Plots of X-ray versus UV emission show that the emission from the smaller microflares is softer than that from the larger microflares and subflares. Distributions of solar flares with energy that are based on hard X-ray fluxes can be corrected using this X-ray/UV relationship. The correcteddistributions suggest that microflares play a larger role in coronal heating than was indicated by analysis of the original distributions.

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Documento generato il 26/11/20 alle ore 19:53:36