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- W2023563614 abstract "view Abstract Citations (13) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Plasma Emission from Isotropic Langmuir Turbulence: Are Radio Microbursts Structureless? Gopalswamy, N. Abstract The brightness temperature of radio emission through the fundamental and second harmonic plasma processes is determined for isotropic Langmuir waves of low-energy density in order to account for the microbursts at meter-dekameter wavelengths. The probable cause for low levels of Langmuir turbulence is the presence of isotropic density fluctuations in the corona which isotropize the beam-generated Langmuir waves. We determined the energy density of Langmuir waves attainable from the beam-plasma instability in the presence of isotropic density fluctuations. Since the electron density fluctuations isotropize the beam-generated plasma waves, the head-on collision of plasma waves becomes efficient to produce the second harmonic plasma emission. For reasonable beam parameters, the brightness temmperature of the fundamental never exceeds 10 exp 6 K, while the second harmonic covers the observed range of microburst brightness temperatures. Thus, the microbursts are predominantly at second harmonic. This leads to an important conclusion that the microbursts are structureless, similar to a population of normal type III bursts of low polarization with no fundamental-harmonic structure. Publication: The Astrophysical Journal Pub Date: January 1993 DOI: 10.1086/172136 Bibcode: 1993ApJ...402..326G Keywords: Isotropic Turbulence; Magnetohydrodynamic Turbulence; Plasma Radiation; Solar Radio Emission; Type 3 Bursts; Electrostatic Waves; Emission Spectra; Solar Corona; Solar Physics; RADIATION MECHANISMS: MISCELLANEOUS; SUN: CORONA; SUN: RADIO RADIATION full text sources ADS |" @default.
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- W2023563614 date "1993-01-01" @default.
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- W2023563614 title "Plasma emission from isotropic Langmuir turbulence - Are radio microbursts structureless?" @default.
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