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Record Details

Record 68 of 2243
First dynamic spectra of stellar microwave flares
External Online Source: doi:10.1038/326678a0
Author and Affiliation:
Bastian, T. S.(Colorado, University, Boulder, United States)
Bookbinder, J. A.(Joint Institute for Laboratory Astrophysics, Boulder, CO, United States)
Abstract: The VLA has been used in the spectral-line mode at 1.4 GHz to obtain the first dynamic spectra of stellar sources other than the sun. Two very intense, highly circularly polarized, microwave outbursts were observed on the dMe flare star UV Cet, in addition to a slowly varying, unpolarized component. One outburst was purely left circularly polarized and showed no variations as a function of frequency across the 41 MHz band, whereas the other was as much as 70 percent right-circularly polarized and showed distinct variations with frequency. Although the slowly varying emission is probably due to incoherent gyrosynchrotron emission, the two flaring events are the result of coherent mechanisms. The coherent emission is interpreted in terms of plasma radiation and the cyclotron maser instability.
Publication Date: Apr 16, 1987
Document ID:
19870052382
(Acquired Nov 28, 1995)
Accession Number: 87A39656
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Nature (ISSN 0028-0836); 326; 678-680
Publisher Information: United Kingdom
Contract/Grant/Task Num: NSG-7287; NAGW-91; NGL-06-003-057
Financial Sponsor: NASA; United States
Organization Source: Colorado Univ.; Boulder, CO, United States
Joint Inst. for Lab. Astrophysics; Boulder, CO, United States
Description: 3p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CIRCULAR POLARIZATION; MICROWAVE EMISSION; PLASMA RADIATION; RED DWARF STARS; STELLAR FLARES; STELLAR SPECTRA; MASERS; RADIANT FLUX DENSITY; SOLAR CORONA; STELLAR MAGNETIC FIELDS
Imprint And Other Notes: Nature (ISSN 0028-0836), vol. 326, April 16, 1987, p. 678-680.
Availability Source: Other Sources
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