Some radar observations of meteors and aurorae at 300 and 500 Mc/s using a large radio telescope--II Observations of the aurora borealis

Details Some radar observations of meteors and aurorae at 300 and 500 Mc/s using a large radio telescope--II Observations of the aurora borealis Some radar observations of meteors and aurorae at 300 and 500 Mc/s using a large radio telescope--II Observations of the aurora borealis

Jul 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962jatp...24..599b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 24, no. 7, pp. 599-602, IN5-IN6, 603-607

Physics

1

Scientific paper

Radar echoes from the aurora borealis have been obtained at frequencies of 300 and 500 Mc/s using a 250 ft radio telescope. Strong echoes detected during the afternoon hours originated from a layer of ionization at a mean height of 110 km and less than a few kilometres thick. Isolated weak echoes observed at other times originated from localized regions having individual heights between 104 and 124 km. The echoes were aspect sensitive in relation to the geomagnetic field lines with the signal strength falling by 10 dB at 1° from perpendicularity. Ionization was also detected in the auroral zone at a height of 185 km and in a position corresponding to specular reflection. The strong echoes coincided with marked disturbances in the geomagnetic field; there was no such correlation in the case of the weak echoes.

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