First high spatial resolution interferometric observations of solar flares at millimeter wavelengths

Details First high spatial resolution interferometric observations of solar flares at millimeter wavelengths First high spatial resolution interferometric observations of solar flares at millimeter wavelengths

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358l..69k&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 358, Aug. 1, 1990, p. L69-L73.

Astronomy and Astrophysics

Astrophysics

20

Microwave Interferometers, Millimeter Waves, Solar Flares, Spatial Resolution, Diffraction Patterns, Solar Radio Bursts, Synchrotron Radiation

Scientific paper

The 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.

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