Solar Physics

, Volume 13, Issue 2, pp 372–388 | Cite as

Variations in solar emission at 3.3 mm wavelength and their relation to flares

  • Earle B. Mayfield
  • John Higman
  • Clifton Samson
Article
Revised:

Abstract

An investigation of variations in solar radio emission at 3.3 mm wavelength as observed with an antenna of half-power beamwidth of 2.8 arc-min indicates the existence of hot stable regions associated with sunspots. These regions are enhanced from 240 K (4%) to more than 3200K (50%) over the quiet center of the disk temperature of 6 600K. Positions of maximum enhancement occur near the neutral lines of primarily bipolar magnetic fields as determined from magnetograms of the longitudinal component of the field. Fourteen of the 113 regions studied were observed to produce flares reported as importance class 2 or greater during the period from mid-February through mid-August 1967. Eleven of the regions which flared had an enhancement of 8.5% or greater and a temperature gradient of 0.5%/deg or greater.

Keywords

Magnetic Field Flare Temperature Gradient Stable Region Radio Emission 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© D. Reidel Publishing Company 1970

Authors and Affiliations

  • Earle B. Mayfield
    • 1
  • John Higman
    • 2
  • Clifton Samson
    • 2
  1. 1.San Fernando Observatory, Aerospace CorporationEl SegundoU.S.A.
  2. 2.United States Air ForceU.S.A.

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