Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph..102..147h&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 102, no. 1-2, Dec. 1985, p. 147-158.
Astronomy and Astrophysics
Astronomy
20
Solar Activity, Solar Flares, Spaceborne Astronomy, X Ray Spectroscopy, Arches, Brightness, Solar Magnetic Field, Solar Maximum Mission, Time Response
Scientific paper
A single arch of May 21/22 and a repetitive arch of November 6, 1980 imaged by the Hard X-ray Imaging Spectrometer aboard the SMM are examined and compared. Values for physically relevant quantities of the May 21/22 march at the time of its maximum brightness are: (1) a temperature of about 6.3 x 10 to the 6th K, (2) an electron density of about 1.1 x 10 to the -9th/cu cm, (3) a total emitting volume of about 5 x 10 to the 29th cu cm, (4) an energy density of about 2.9 erg/cu cm, (5) a total energy content of about 1.4 x 10 to the 30th erg, and (6) a total mass of about 9 x 10 to the 14th g. The top of the arch was observed at an altitude of about 145,000 km within 1.5 hr after the flare occurrence. It is speculated that the arch rose to its stationary position with an average velocity exceeding 17 km/s. Moreover, it formed very fast at the flare onset, when part of the active region loop system was elevated within minutes to the observed altitude.
Hick Pierre P.
Svestka Zdenek
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