Very large array observations of solar active regions. IV. Structure and evolution of radio bursts from 30 centimeter loops

Journal Article · Sun Apr 01 00:00:00 EST 1984 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/161905· OSTI ID:6861423

Willson, R F; Lang, K R

The Very Large Array (VLA) has been used to study the structuree and evolution of six solar bursts near 20 cm wavelength. In most ccases the burst emission has been resolved into looplike structures with total lengths, Lapprox.3 x 10/sup 9/ cm, brightness temperatures T/sub B/approx.10/sup 7/-10/sup 8/ K, and degrees of circular polarization p/sub c/< or approx. =90%. changes in the total intensity and circular polarization of the bursts occur on time scales as short as 10 s. The individual peaks of one multiple-component burst originated in different locations within a magnetically complicated region. Preburst heating occurred minutes before the onset of the impulsive phase of one burst, and circular polarization changes occurred minutes before the onset of the impulsive phase of another burst. In one case, a loop system emerged in the vicinity of the impulsive source, and two adjacent loop systems may have emerged and triggered the burst.

• Research Organization: Department of Physics, Tufts University
• OSTI ID: 6861423
• Journal Information: Astrophys. J.; (United States), Vol. 279:1
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SOLAR RADIO BURSTS
INTERFEROMETRY
MAPS
MORPHOLOGY
MAGNETIC FIELDS
POLARIZATION
SOLAR ACTIVITY
SOLAR RADIOWAVE RADIATION
ELECTROMAGNETIC RADIATION
RADIATIONS
RADIOWAVE RADIATION
SOLAR RADIATION
STELLAR RADIATION
640104* - Astrophysics &amp; Cosmology- Solar Phenomena