VLA (Very Large Array) observations of solar active regions at closely spaced frequencies. Evidence for thermal cyclotron line emission
Technical Report
·
OSTI ID:5684566
VLA observations of a solar-active region at 10 closely spaced frequencies between 1440 and 1720 MHz are presented. The synthesis maps show, on two successive days, significant changes in the brightness temperature within this narrow frequency range. It is shown that these changes cannot be due to either thermal bremsstrahlung or gyroresonance emission from a coronal loop in which the temperature, density, or magnetic field varies monotonically with height. Instead, the brighness spectrum is attributed to cyclotron line emission from a narrow layer where the temperature is elevated above the surrounding part of the loop.
- Research Organization:
- Tufts Univ., Medford, MA (USA). Dept. of Physics and Astronomy
- OSTI ID:
- 5684566
- Report Number(s):
- AD-A-166118/0/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCELERATORS
ANTENNAS
ATMOSPHERES
BREMSSTRAHLUNG
BRIGHTNESS
CYCLIC ACCELERATORS
CYCLOTRON RESONANCE
CYCLOTRONS
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EMISSION SPECTRA
EQUIPMENT
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 01-100
LAYERS
MAGNETIC FIELDS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
RADIO EQUIPMENT
RADIO TELESCOPES
RADIOWAVE RADIATION
RESONANCE
SOLAR ACTIVITY
SOLAR CORONA
SPECTRA
STELLAR ATMOSPHERES
STELLAR CORONAE
TELESCOPES
THERMAL RADIATION
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCELERATORS
ANTENNAS
ATMOSPHERES
BREMSSTRAHLUNG
BRIGHTNESS
CYCLIC ACCELERATORS
CYCLOTRON RESONANCE
CYCLOTRONS
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EMISSION SPECTRA
EQUIPMENT
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 01-100
LAYERS
MAGNETIC FIELDS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
RADIO EQUIPMENT
RADIO TELESCOPES
RADIOWAVE RADIATION
RESONANCE
SOLAR ACTIVITY
SOLAR CORONA
SPECTRA
STELLAR ATMOSPHERES
STELLAR CORONAE
TELESCOPES
THERMAL RADIATION