Impulsive microwave burst and solar noise storm emission resolved with the VLA

Journal Article · Thu Feb 01 00:00:00 EST 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168437· OSTI ID:7135274

Willson, R F; Lang, K R; Liggett, M ^[1]

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1. Tufts Univ., Medford, MA (USA) California Institute of Technology, Pasadena (USA)

The evolution of a microwave burst at 20.7 cm wavelength and a type I noise storm at 91.6 cm wavelength are examined using VLA. The magnetic loops in the two spectral regions are studied. The sizes and brightness temperatures of the 20.7 cm burst sources are compared with those predicted by multithermal and nonthermal models of microwave burst emission of Dulk and Dennis (1982). The data reveal that: (1) the precursor, impulsive, and post-impulsive phases of the 20.7 cm burst are located in spatially separated sources; (2) the gradual enhancement of a 91.6 cm noise storm continuum source suggests a feed-back mechanism exists between activity in higher and lower lying loops; and (3) the derived magnetic field strengths at 20.7 cm for the nonthermal models are 35-160 G with core field strengths of 125-220 G. 50 refs.

• OSTI ID: 7135274
• Journal Information: Astrophysical Journal; (USA), Vol. 350; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SOLAR RADIO BURSTS
ORIGIN
BRIGHTNESS
COMPARATIVE EVALUATIONS
COORDINATES
MAGNETIC FIELDS
MICROWAVE RADIATION
PHOTOSPHERE
SOLAR CORONA
SOLAR RADIATION
SUNSPOTS
ATMOSPHERES
ELECTROMAGNETIC RADIATION
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
RADIOWAVE RADIATION
SOLAR ACTIVITY
SOLAR ATMOSPHERE
STARSPOTS
STELLAR ACTIVITY
STELLAR ATMOSPHERES
STELLAR CORONAE
STELLAR RADIATION
640104* - Astrophysics & Cosmology- Solar Phenomena