HF echoes from ionization potentially produced by high-altitude discharges

Details HF echoes from ionization potentially produced by high-altitude discharges HF echoes from ionization potentially produced by high-altitude discharges

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...102.4613r&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A3, p. 4613-4622

Physics

14

Ionosphere: Ionization Mechanisms, Ionosphere: Ionospheric Irregularities, Meteorology And Atmospheric Dynamics: Atmospheric Electricity, Meteorology And Atmospheric Dynamics: Lightning

Scientific paper

The presence of ionization associated with high-altitude discharges has been detected using an HF radar operating at 2.2, 2.5, and 2.8 MHz. On several occasions, oblique echoes lasting several hundred ms at night and 1->10s during the day were observed. The echoes turned on in several interpulse times of 70 ms and were generally correlated with strong lightning activity prior to onset. The angles of arrival of sferics detected at three goniometer stations were used to determine the distance to thunderstorms. The data are consistent with specular reflections from columns of ionization produced at 55-65 km altitude and having minimum electron densities of 6×104-105cm-3. The source of the ionization is believed to be high-altitude discharges.

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