Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..677b&link_type=abstract
Astrophysical Journal, Part 1, vol. 264, Jan. 15, 1983, p. 677-688. Research supported by the Swiss National Science Foundation
Astronomy and Astrophysics
Astrophysics
33
Fine Structure, Solar Magnetic Field, Solitary Waves, Type 4 Bursts, Whistlers, Electrostatic Waves, Solar Corona, Turbulence Effects
Scientific paper
Observations with a digital spectrometer within the frequency band between 250 and 273 MHz of fiber fine structures during the type IV solar radio burst of 1978 October 1 are presented and analyzed. The results are summarized in histograms. Typical values for drift rates are in the range between -2.3 and -9.9 MHz s-1. Frequency intervals between absorption and emission within the spectrum were measured to be within 0.9 and 2.7 MHz. Several types of spectra are discussed.
A theoretical interpretation is based upon the model of a population of electrons trapped within a magnetic-mirror loop-configuration. It is shown that the fiber emission can be explained assuming an interaction between spatially localized strong whistler turbulence (solitons) and a broad-band Langmuir wave spectrum. Estimates using the observed flux values indicate that a fiber is composed of some 1011 - 1014 solitons occupying a volume of about 1011 - 108 km3. Ducting of whistler solitons in low-density magnetic loops provides a plausible explanation for coherent behavior during the lifetime of an individual fiber. The magnetic field strength is found to be 6.2 ≤ B ≤ 35 gauss at the radio source and 15.3 ≤ B ≤ 76 gauss at the lower hybrid wave level respectively.
The quasi-periodicity of the fiber occurrence is interpreted as periodically switched-on soliton production.
Bernold E. X. T.
Treumann Rudolf A.
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