Multi-wave band SMM-VLA observations of an M2 flare and an associated coronal mass ejection

Details Multi-wave band SMM-VLA observations of an M2 flare and an associated coronal mass ejection Multi-wave band SMM-VLA observations of an M2 flare and an associated coronal mass ejection

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...378..360w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 378, Sept. 1, 1991, p. 360-371. Research supported by Lockheed Corp.

Other

2

Solar Corona, Solar Flares, Solar X-Rays, Very Large Array (Vla), Circular Polarization, H Alpha Line, Line Spectra, Metallicity, Solar Magnetic Field, Stellar Mass Ejection

Scientific paper

Results are presented of observations of an M2 flare and an associated coronal mass ejection CME by instruments on the SMM as well as by the VLA and other ground-based observatories on September 30, 1988. The multiwave band data show a gradual slowly changing event which lasted several hours. The microwave burst emission was found to originate in compact moderately circularly polarized sources located near the sites of bright H-alpha and soft X-ray emission. These data are combined with estimates of an electron temperature of 1.5 x 10 to the 7th K and an emission measure of about 2.0 x 10 to the 49th/cu cm obtained from Ca XIX and Fe XXV spectra to show that the microwave emission can be attributed to thermal gyrosynchrotron radiation in regions where the magnetic field strength is 425-650 G. The CME acceleration at low altitudes is measured on the basis of ground- and space-based coronagraphs.

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