Radio Observations of the Emergence of a Solar Active Region

Details Radio Observations of the Emergence of a Solar Active Region Radio Observations of the Emergence of a Solar Active Region

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spd....28.0603w&link_type=abstract

American Astronomical Society, SPD meeting #28, #06.03; Bulletin of the American Astronomical Society, Vol. 29, p.910

Astronomy and Astrophysics

Astronomy

Scientific paper

On July 6 1996 a solar active region abruptly began to emerge through the solar photosphere. This region was eventually to produce the first X-class flare since 1993. We happened to be observing the region with the VLA during its emergence, and present a preliminary report on the observations in this paper. The radio data are the only means for observing the magnetic fields of the emerging region in the corona, and can thus be used to test models for the structure of emerging magnetic fields. In this case, we do not see any evidence for strong coronal fields during the initial emergence, indicating that the field lines diverge rapidly above the photosphere as expected from simple theory. We follow the emergence of flux over several days and discuss the implications of these observations for theories of flux emergence.

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