Physics
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59..903n&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, v. 59, p. 903-924.
Physics
2
Scientific paper
Characteristic examples of the location, spatial scale and motion of radio were absorption events in the cusp-latitude ionosphere are obtained from daytime observations on 18 September and 17 October, 1992, by imaging riometers in the Arctic region. One case observed near local magnetic noon at Ny-Ålesund, Svalbard (invariant lat. = 76.1°) displays small-scale absorption events of 100-200 km in extent superposed on large-scale absorption features extending at least 700 km in longitude toward the prenoon sector. Many of the small-scale absorption events show quasi-periodic variations with repetition periods of 3-5 min which correlate well with local magnetic variations. Short-lived, impulsive absorption events (1-3 min duration) found among the quasi-periodic variations corresponded to impulsive magnetic variations observed over a wide range of magnetometer stations. Some of these impulsive events showed northward or northeastward motions. This case is interpreted in terms of the variable precipitation of high-energy substorm electrons. Another characteristic case observed in the noon sector at cusp-latitudes is an event of slowly varying absorption intensities associated with magnetic bays in the cusp and polar cap regions during conditions of strongly negative IMF-By component (Bz ~ 0). An interesting feature of this event is the observed antisunward motion of the front-like absorption features extending over 700 km in longitude. From these characteristics the slowly varying absorption intensities are interpreted in terms of E-region ionospheric disturbances related to the east-west oriented DPY currents in the cusp and polar cap.
Holtet J. A.
Nishino Masamichi
Rosenberg T. J.
Stauning Peter
Yamagishi Hidenaga
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