Physics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9712187w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A8, Aug. 1, 1992, p. 12,187-12,202. Research supported by South A
Physics
142
Extremely Low Radio Frequencies, Geomagnetic Pulsations, Magnetopause, Radar Measurement, Solar Terrestrial Interactions, Earth Magnetosphere, Field Aligned Currents, Waveguides
Scientific paper
Techniques which allow the instantaneous amplitude and phase to be determined as functions of geomagnetic lattitude, longitude, and time are employed to carry out a detailed analysis of HF radar data of a ULF pulsation event in the postmidnight sector on January 11, 1989. Field line resonances with several different frequencies occur simultaneously at different latitudes. These can be associated with cavity mode frequencies of 1.3 mHz, 1.9 mHz, 2.7 mGz, and 3.3 mHz. These frequencies are constant to better than 10 percent over a local time period of nearly 4 hr. The field-aligned currents driven by the resonances can be as large as 5 micro-A/sq m at ionospheric heights. The data support a picture of modes driven by solar wind impulses.
Baker Kile B.
Greenwald Ray A.
Ruohoniemi Michael J.
Samson John C.
Walker D. M. A.
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