Observations of large-scale coherent pulsating electron precipitation events in the auroral zone, accompanied by geomagnetic continuous pulsations

Details Observations of large-scale coherent pulsating electron precipitation events in the auroral zone, accompanied by geomagnetic continuous pulsations Observations of large-scale coherent pulsating electron precipitation events in the auroral zone, accompanied by geomagnetic continuous pulsations

Apr 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967jatp...29..395u&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 29, no. 4, pp. 395-410

Physics

3

Scientific paper

Through balloon observations of X-ray bremsstrahlung in the auroral zone pulsating electron precipitation events have been found that are coherent over areas of at least several hundred kilometers in both the N-S and E-W directions. During one such event, which was observed simultaneously from three widely separated balloons in 1964, the X-ray intensity peaks were found to be simultaneous within the accuracy of measurement, which was one second or less. The X-ray pulsations had periods between 65 and 100 sec, and lasted for more than two hours around local noon. This noon-time pulsating electron precipitation arose nearly out of the cosmic-ray background, and did not seem to be caused by modulation of a continuously existing electron flux. It was accompanied by geomagnetic continuous pulsations, but these did not always show that the same period as the X-ray variations. There are indications that the pulsating electron flux and the accompanying MHD-wave were related, and that both phenomena may have been generated in the same process through interaction of the solar wind with the sunward side of the magnetosphere. Two probably similar events were observed in 1965, also around local noon.

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