Physics
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jatp...37...55u&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 37, Jan. 1975, p. 55-64.
Physics
1
Auroral Echoes, Polar Substorms, Radar Signatures, Radio Auroras, Conjugate Points, Pulse Radar, Time Response, Very High Frequencies
Scientific paper
Data from a VHF auroral radar in the south of New Zealand together with relevant geophysical data from Campbell Island and the conjugate region in Alaska reveal a characteristic pattern of radio auroral echoes which can be associated with the onset and initial development of the expansive phase of polar substorms. The radar signature takes the form of the sudden appearance of type B2 radio aurora on the range-time display. The range discrimination obtainable with a radar system enables, with some limitations, the L shell of the substorm onset to be determined, and the subsequent poleward expansion to be followed. A smaller equatorward expansion is characteristic. Although the auroral radar is not a particularly sensitive detector of polar substorms at L less than 5, it is pointed out that a network of simple VHF instruments has some advantages over all-sky cameras, magnetometers, or riometers.
Keys J. G.
Unwin R. S.
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