Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274..487c&link_type=abstract
Astronomy and Astrophysics, Vol. 274, p. 487 (1993)
Astronomy and Astrophysics
Astrophysics
38
Sun: Bursts, Sun: Flares, Sun: Radio Radiation, Millisecond Spikes
Scientific paper
The bandwidth of 196 individual millisecond spikes has been measured and analyzed. The spikes occurred in the impulsive phase of eight solar flares in different active regions. The measurements have been made at various frequency resolutions and spectral windows in the range from 0.1 to 8.5 GHz. The major results are (i) that the individual bandwidths show a scatter of a factor 2-3 or more within an event, (ii) that the mean bandwidth differs significantly from event to event at the same center frequency, (iii) that the mean bandwidth increases only slightly with the center frequency and (iv) that there is no qualitative difference between spikes in decimeter waves and spikes in microwaves. The results show that there is no intrinsic bandwidth of spikes, suggesting that accidental source parameters are responsible for the width of the emission. The observed decrease of the mean Δν/ν with frequency is interpreted as a decrease of the mean source diameter at lower source altitude.
Benz Arnold O.
Csillaghy Andre
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