Investigation of coronal active region loop structures using AS E rocket X-ray images. Final Report, 31 March 1982-31 March 1983

Technical Report · Fri Apr 01 04:00:00 EST 1983

OSTI ID:5659641

Webb, D F

Simultaneous high spatial resolution observations at 6 cm in soft X-rays, in photospheric magnetograms, and in optical filtergrams were used to compare the most intense sources of centimetric emission in two active regions to coronal loops, sunspots, chromospheric structures, and photospheric magnetic fields. Results show that the majority of the bright microwave components are not associated with sunspots or X-ray emission. A nonthermal mechanism appears necessary to explain the brightest microwave components, discrete regions of continuous particle acceleration may be common in active regions. Studies of the plasma parameters of selected loops imply that the radio emission is consistent with gyro-resonance absorption at the third and fourth harmonic, at least from part of each loop. Results are presented for: (1) X-ray and microwave observations of active regions (2) comparison of coronal holes observed in soft X-rays and Hel 10830 A spectrosheliograms and (3) the reappearance of polar coronal holes and the evolution of the solar magnetic field.

• Research Organization: American Science and Engineering, Inc., Cambridge, MA
• OSTI ID: 5659641
• Report Number(s): N-8324454; NASA-CR-170284
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BREMSSTRAHLUNG
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
MICROWAVE RADIATION
RADIATIONS
RESOLUTION
SOFT X RADIATION
SOLAR ACTIVITY
SOLAR CORONA
SOLAR X-RAY BURSTS
SPATIAL RESOLUTION
TEMPERATURE DISTRIBUTION
X RADIATION