Accession Number:

ADA126640

Title:

Three Dimensional Structure and Time Development of Radio Emission from Solar Active Regions.

Descriptive Note:

Final rept. 1 May 80-31 Dec 82,

Corporate Author:

TUFTS UNIV MEDFORD MA DEPT OF PHYSICS

Personal Author(s):

Report Date:

1983-01-15

Pagination or Media Count:

126.0

Abstract:

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.

Subject Categories:

  • Astrophysics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE