Physics
Scientific paper
Nov 1959
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1959natur.184.1471w&link_type=abstract
Nature, Volume 184, Issue 4697, pp. 1471-1472 (1959).
Physics
Scientific paper
A POSSIBLE relation between Type II (slow-drift) bursts of solar radio noise and occurrence of geomagnetic disturbance has been suggested by Maxwell, Thompson and Garmire1,2 and by Roberts3. Excitation of plasma oscillations by an outward-moving stream of particles that later reaches the Earth provides a model consistent with radio observations and with the known relations between solar flares and geomagnetic disturbance. According to this model, as the particle stream moves outward, radiation is induced at the plasma frequency (or at the critical frequency) at locations in the solar corona of progressively lower density. Thus the observed rate of decrease of frequency can be related to a velocity, if some model of coronal density is assumed4. Further, we might expect that particles with high velocity at great heights would be more likely to escape from the solar atmosphere and to cause geomagnetic disturbance than those decelerated to low velocity at large heights. Hartz5 has concluded from frequency drifts deduced from observations at single fixed frequencies that such a relation does indeed exist.
Warwick Constance S.
Wood Marion B.
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