Nonpotential magnetic fields at sites of gamma-ray flares

Conference · Fri Jun 01 00:00:00 EDT 1990 · Astrophysical Journal, Supplement Series; (USA)

OSTI ID:6863601

Hagyard, M J; Venkatakrishnan, P; Smith, Jr, J B

The relation between the degree of nonpotentiality of photospheric magnetic fields and the occurrence of gama-ray flares is examined to determine whether there are special signatures of the stressed fields for this type of flare. Observations of the flares in the active region of April 1984 (AR 4474) are analyzed, showing that the big flare initiated at the location on the magnetic neutral line where the field deviated the most from a potential field. The nonpotential signatures of AR 4474 are compared with those of four other regions. The results suggest that gamma-ray flares are associated with strongly nonpotential fields that extend over relatively larger lengths of the magnetic neutral line that the fields associated with flares that do not produce gamma-ray events. 9 refs.

• OSTI ID: 6863601
• Report Number(s): CONF-8809494-; CODEN: APJSA; TRN: 90-030166
• Journal Information: Astrophysical Journal, Supplement Series; (USA), Vol. 73; Conference: 2. workshop on impulsive solar flares, Durham, NH (USA), 26-28 Sep 1988; ISSN 0067-0049
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
PHOTOSPHERE
MAGNETIC FIELDS
SOLAR FLARES
GAMMA RADIATION
COMPARATIVE EVALUATIONS
CORRELATIONS
ORIGIN
ATMOSPHERES
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
RADIATIONS
SOLAR ACTIVITY
SOLAR ATMOSPHERE
640104* - Astrophysics & Cosmology- Solar Phenomena