Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....56..251p&link_type=abstract
Astronomy and Astrophysics, vol. 56, no. 1-2, Apr. 1977, p. 251-257.
Astronomy and Astrophysics
Astrophysics
13
Landau Damping, Plasma Waves, Spectrographs, Type 3 Bursts, Curve Fitting, Digital Systems, Electron Beams, Line Shape, Plasma-Particle Interactions, Real Time Operation
Scientific paper
The exciter-function profile of 25 type III bursts observed at 169 MHz is computed by deconvolving the observed burst time profiles on the basis of the collisional-damping hypothesis. The digitized real-time output of a multichannel spectrograph comprises the data set for the analysis. Results are presented which show that the approximate one-to-one relationship between exciter duration and e-folding time is valid at 169 MHz, which is three times higher than the frequency previously studied in the same context. The small scatter found in the relationship is taken as a strong suggestion that the Landau effect is the main damping mechanism for plasma waves excited by an electron beam even at low coronal heights. It is concluded that the observed burst profile should be very close to the exciter profile over the range from a height of 0.3 solar radius out to earth's orbit.
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