Three Dimensional Structure and Time Development of Radio Emission from Solar Active Regions.
Final rept. 1 May 80-31 Dec 82,
TUFTS UNIV MEDFORD MA DEPT OF PHYSICS
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The three dimensional structure of quiescent active regions is determined by simultaneous multiple wavelength observations. Synthesis maps obtained with the Very Large Array V.L.A. at 2 cm, 6 cm and 20 cm wavelength are compared with Solar Maximum Mission satellite observations at X-ray and E.U.V. extreme ultraviolet wavelengths, Westerbork Synthesis Radio Telescope observations at 6 cm wavelength, and H alpha and offband H alpha observations at the Big Bear, Ottawa River and Meudon Observatories. The 6 cm radiation of solar active regions is due to plague-associated bremsstrahlung and sunspot-associated gyroemission. The sunspot-associated component does not emit detectable X-ray radiation, whereas the plague-associated component does. Snapshot maps made at 10 second intervals during solar bursts provide evidence for preburst heating and for magnetic changes before and during solar bursts.