Pre-absorption Events at 230 Mc/s

Details Pre-absorption Events at 230 Mc/s Pre-absorption Events at 230 Mc/s

Mar 1966

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966natur.209.1014a&link_type=abstract

Nature, Volume 209, Issue 5027, pp. 1014 (1966).

Physics

2

Scientific paper

THE Type IV radio event of February 5, 1965, was observed with the University of Michigan 28-ft. paraboloid at frequencies of 230 and 345 Mc/s. Following 1847 U.T. many short-duration bursts similar to the `spike' bursts described by de Groot1 were observed, superimposed on the continuum at these two frequencies. This communication describes four bursts at 230 Mc/s which were preceded by brief decreases in the background radiation intensity. We interpret these decreases as absorption of the type IV continuum. The four events occurred between 1849 and 1851 U.T. Although numerous bursts occurred at 345 Mc/s, no similar pre-absorptions were observed at this frequency. No instances of post-absorption events were evident on either frequency. Three of the pre-absorption events are shown in Fig. 1. The characteristics of the events are given in Table 1. The flare with which the radio events were associated started at 1750 U.T. and reached a maximum near 1810 U.T. Type IV radiation was observed at metre wave-lengths at Fort Davis from 1800 until 1940 U.T. and at decametre wave-lengths at Boulder from 1810 until 1905 U.T.

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