Doppler radio observations of 3-meter irregularities in the polar cap E region

Details Doppler radio observations of 3-meter irregularities in the polar cap E region Doppler radio observations of 3-meter irregularities in the polar cap E region

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.1271s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Feb. 1, 1987, p. 1271-1276. NSERC-supported research.

Physics

8

Doppler Radar, E Region, Magnetohydrodynamic Stability, Polar Caps, Radar Tracking, Radio Scattering, Backscattering, Radar Signatures, Signal Analysis, Very High Frequencies

Scientific paper

Results obtained (in July 1982) from the first VHF Doppler radar in the polar cap E region during a typical backscatter period in the evening time sector are presented. A large number of simultaneous spectra (about 400 pairs from both links) were computed in an attempt to identify the 3-m irregularities present in the plasma. The Doppler spectra obtained show all the usual spectral types (I, II, and III) typical of the auroral zone. While the spectral characteristics of the polar cap and auroral zone echoes are similar, the observed temporal morphology of the polar cap echoes is quite different from that of auroral zone echoes. There is a strong tendency for polar cap echoes to maximize in the premidnight period; i.e., during the same period when the Harang discontinuity is occurring in the auroral zone. After magnetic midnight, there is often a complete absence of polar cap VHF scatter, unlike the auroral zone, where echoes from the westward electrojet often continue until magnetic dawn.

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