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Dual frequency observations of solar microwave bursts using the VLASimultaneous VLA observations of microwave bursts at 6 and 2 cm in a solar active region are presented and discussed. Using the full-day synthesis, I and V maps of the active region are produced. The radiation mechanisms at these wavelengths are discussed and the upper and lower bounds on the magnetic field of the active region are derived. The magnetic fields in the microwave burst source are estimated from the brightness temperature and the degree of circular polarization. It is concluded that the 6 cm radiation originates from the bulk heated plasma, whereas the 2 cm radiation is due to the nonthermal particles generated in the energy-release process. The delay between the peaks of emission at the two wavelengths is interpreted using a dc electric field model of flares. Depending on the strength of the electric field and the density in the flaring region, delays in either sense can be observed.
Document ID
19850054667
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Shevgaonkar, R. K.
(Indian Institute of Astrophysics, Bangalore, India; Maryland, University College Park, MD, United States)
Kundu, M. R.
(Maryland, University College Park, MD, United States)
Date Acquired
August 12, 2013
Publication Date
May 15, 1985
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 292
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
85A36818
Funding Number(s)
CONTRACT_GRANT: NGR-21-002-199
CONTRACT_GRANT: NSF ATM-81-03089
Distribution Limits
Public
Copyright
Other

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