The signature of auroral kilometric radiation on Isis 1 ionograms

Details The signature of auroral kilometric radiation on Isis 1 ionograms The signature of auroral kilometric radiation on Isis 1 ionograms

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86...76c&link_type=abstract

Journal of Geophysical Research, vol. 86, Jan. 1, 1981, p. 76-82.

Computer Science

Sound

56

Auroras, Ionograms, Ionospheric Sounding, Isis-A, Kilometric Waves, Ionosondes

Scientific paper

Auroral kilometric radiation (AKR) appears on the Isis 1 topside sounder ionograms as intense noise bands between the electron cyclotron frequency and 700 kHz. A variable gap occurs between the cyclotron frequency and the lowest AKR frequency. As Isis 1 traverses the source region, the gap narrows, and the AKR signals at higher frequencies weaken. This signature suggests that the AKR waves are generated directly in the extraordinary mode at frequencies just above the local cutoff frequency and that the radiation is initially perpendicular to the magnetic field.

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