Optical and radio observations of the 1980 March 29, April 30, and June 7 flares

Journal Article · Sun Mar 15 04:00:00 EST 1981 · Astrophys. J., Lett. Ed.; (United States)

DOI:https://doi.org/10.1086/183507· OSTI ID:6196548

Rust, D M; Benz, A; Hurford, G J; Nelson, G; Pick, M; Ruzdjak, V

Ground-based solar observations are analyzed for three of the flares discussed in the accompanying Solar Maximum Mission reports. The principal conclusions are that H..cap alpha.. begins to brighten several minutes before the impulsive, hard X-ray bursts, that the preflare heating and impulsive phases of the three flares occurred in loop-shaped structures of about 3500 km semidiameter, and that after the impulsive phase a much larger volume (approx.200 times) of flare plasma was present for the flare main phase. Evidence is presented for the escape 100--500 keV electrons into the larger volume and into the corona during the impulsive phase. For the April 30 flare, the inferred origin of the hard X-ray burst is near the feet of the magnetic loops.

• Research Organization: American Science and Engineering, Inc., Cambridge, Massachusetts
• OSTI ID: 6196548
• Journal Information: Astrophys. J., Lett. Ed.; (United States), Journal Name: Astrophys. J., Lett. Ed.; (United States) Vol. 244:3; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BALMER LINES
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
EMISSION
ENERGY SPECTRA
FERMIONS
LEPTONS
MAGNETIC FIELDS
PLASMA
RADIATIONS
RADIOWAVE RADIATION
SOLAR ACTIVITY
SOLAR CORONA
SOLAR ELECTRONS
SOLAR FLARES
SOLAR PARTICLES
SOLAR RADIATION
SOLAR RADIOWAVE RADIATION
SOLAR X-RAY BURSTS
SPECTRA
STELLAR RADIATION