VLA observations of the coronal plasma
Conference
·
OSTI ID:6742019
VLA observations at 20 cm wavelength specify the brightness temperature and magnetic structure of plasma constrained within coronal loops in solar active regions. Comparisons with simultaneous SMM observations at soft x ray wavelengths lead to measurements of physical parameters like electron density, electron temperature and magnetic field strength. Such comparisons also indicate coronal loops can be detected at either radio or x ray wavelengths while remaining invisible in the other spectral domain, and that the dominant radiation mechanisms can be thermal bremsstrahlung or thermal gyroresonance radiation. VLA observations at the longer 90 cm wavelength reveal the thermal emission of a hot transition sheath enveloping a cooler, underlying H alpha filament seen in absorption. The 20 cm VLA observations indicate that the precursor, impulsive and post-flare components of solar flares originate in spatially separated and resolved sources. The 90 cm VLA data indicate that time-correlated radio bursts can occur in active regions on opposite sides of the solar equator. These regions are apparently linked by large scale, trans-equatorial magnetic loops at least 2.6 x 10(exp 5) km (or 6 feet) long; these loops act as magnetic conduits for relativistic electrons moving at one-third the velocity of light.
- Research Organization:
- Tufts Univ., Medford, MA (USA)
- OSTI ID:
- 6742019
- Report Number(s):
- N-90-21711; NASA-CR--186540; NAS--1.26:186540; CONF-8912104--
- Country of Publication:
- United States
- Language:
- English
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· Astrophys. J.; (United States)
·
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Related Subjects
640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
BREMSSTRAHLUNG
BRIGHTNESS
DATA
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
EXPERIMENTAL DATA
INFORMATION
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FLUX
NUMERICAL DATA
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PLASMA
RADIATIONS
SOLAR ACTIVITY
SOLAR CORONA
SOLAR FLARES
STELLAR ATMOSPHERES
STELLAR CORONAE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
BREMSSTRAHLUNG
BRIGHTNESS
DATA
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
EXPERIMENTAL DATA
INFORMATION
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FLUX
NUMERICAL DATA
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PLASMA
RADIATIONS
SOLAR ACTIVITY
SOLAR CORONA
SOLAR FLARES
STELLAR ATMOSPHERES
STELLAR CORONAE