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Title: VLA observations of solar active regions at 6 and 20 CM
Authors: Alissandrakis, C. E
Kundu, M. R
Shevgaonkar, R. K
Keywords: Coronal loops;H alpha line;Photosphere;Solar flares;Solar magnetic field;Solar radio emission;Sunspots;Very large array (Vla)
Issue Date: Nov-1991
Publisher: The European Southern Observatory
Citation: Astronomy and Astrophysics, Vol. 251, No. 1, pp. 276 - 284
Abstract: High-resolution observations are presented of two active regions at 6 and 20 cm over a period of 5 days, together with H-alpha and photospheric magnetic fields. The large-scale emission at 20 cm is associated with the H-alpha plage. In one region the strongest source was over the neutral line, near the tip of an active-region filament, which indicates that the emission probably originated in small-scale coronal loops. In the second region the peak of the emission was near a well-developed sunspot. Neither region showed evidence of large-scale loops joining their preceding and following parts. Several other sources were observed at 20 cm; a source associated with an H-alpha plage region crossed by a filament and one associated with a small bipolar region are briefly discussed. The 6-cm emission from a well-developed spot showed clearly the characteristics expected from gyroresonance model computations.
ISSN: 0004-6361
Appears in Collections:IIAP Publications
IIAP Publications

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