Physics
Scientific paper
Feb 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967natur.213..790e&link_type=abstract
Nature, Volume 213, Issue 5078, pp. 790-792 (1967).
Physics
2
Scientific paper
IT has been proposed by Sturrock1 that the frequency splitting sometimes observed in type II solar radio bursts may be caused by excitation of plasma oscillations by supra-thermal electrons moving through the solar corona in the presence of density irregularities and a weak magnetic field. He showed that in these circumstances electromagnetic waves may be produced at two frequencies, one at the local plasma frequency fp and one at frequency where the local electron gyrofrequency fH << fp . He envisaged the possibility of using the observations to measure the magnetic field intensity, although the utility of type II frequency splitting as a technique for magnetic field measurements appears to be limited by its relatively infrequent occurrence. More recently, however, Ellis and McCulloch2 have reported the observation of large numbers of a new type of solar bursts in which frequency splitting occurs regularly. These have been observed mainly between 20 Mc/s and 50 Mc/s, and usually appear as a pair of bursts separated in frequency by 100-200 c/s and lasting for about 2 sec.
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