Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988tuft.rept.....l&link_type=abstract
Final Technical Report, 1 Jan. 1983 - 31 Aug. 1988 Tufts Univ., Medford, MA. Dept. of Physics and Astronomy.
Astronomy and Astrophysics
Astronomy
Radio Frequency Interference, Radio Signals, Radio Telescopes, Radio Waves, Sensitivity, Solar Corona, Solar Flares, Solar Maximum Mission, Solar Wind, Spatial Resolution, Sun, Very Large Array (Vla), Density Measurement, Energetic Particles, Explosions, Particle Emission, Plasma Frequencies
Scientific paper
Observations of solar active regions with the Very Large Array (VLA) have led to new information about the origin and prediction of explosive bursts, or solar flares, that can directly interfere with high-flying aircraft or disrupt communications with them. We have shown that energetic particles and radiation are expelled during explosive bursts from coronal loops. Several new insights into these exploding loops have been provided using the VLA together with supporting observations with the Solar Maximum Mission (SMM) satellite and the Nancay Radioheliograph (NR). The VLA uniquely provides spatial resolution at radio wavelengths, while the SMM gives X-ray data and the NR provides resolution in time and frequency. All three instruments were used to study the quiescent, or non-flaring, emission from coronal loops, radio bursts from coronal loops, and radio bursts from nearby stars. The ubiquitous coronal loops dominate the structure of the solar corona. Multiple wavelength VLA observations specify the three dimensional structure of solar active regions; they uniquely specify the strength, evolution and structure of the magnetic fields in coronal loops, while also providing constraints on the density and temperature of the energetic plasma trapped within them. Thermal cyclotron lines provide a sensitive measurement of the coronal magnetic field, while comparisons with simultaneous SMM X-ray observations delineate the various radiation mechanisms.
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