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First high spatial resolution interferometric observations of solar flares at millimeter wavelengthsThe first high spatial resolution interferometric observations of solar flares at millimeter wavelengths, carried out with the Berkeley-Illinois-Maryland Array are presented. The observations were made at 3.3 mm wavelength during the very active periods of March 1989, using one or three baselines with fringe spacings of 2-5 arcsec. The observations represent an improvement of an order of magnitude in both sensitivity and spatial resolution compared with previous solar observations at these wavelengths. It appears that millimeter burst sources are not much smaller than microwave sources. The most intense bursts imply brightness temperatures of over 10 to the 6th K and are due to nonthermal gyrosynchrotron emission or possibly thermal free-free emission. If the emission in the flash phase is predominantly due to gyrosynchrotron emission, thermal gyrosynchrotron models can be ruled out for the radio emission because the flux at millimeter wavelengths is too high.
Document ID
19900055814
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kundu, M. R.
(Maryland Univ. College Park, MD, United States)
White, S. M.
(Maryland Univ. College Park, MD, United States)
Gopalswamy, N.
(Maryland, University College Park, United States)
Bieging, J. H.
(California, University Berkeley, United States)
Hurford, G. J.
(California Institute of Technology Pasadena, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1990
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 358
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
90A42869
Funding Number(s)
CONTRACT_GRANT: NSF ATM-87-17157
CONTRACT_GRANT: NSF AST-87-14721
CONTRACT_GRANT: NSF ATM-89-10835
CONTRACT_GRANT: NAGW-1541
CONTRACT_GRANT: NSF AST-87-02682
Distribution Limits
Public
Copyright
Other

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