HF echoes from ionization potentially produced by high-altitude discharges
Journal Article
·
· Journal of Geophysical Research
- Space and Atmospheric Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico (United States)
- Laboratoire de Detection et de Geophysique, Commissariat a LEnergie Atomique, Bruyeres-le-Chatel (France)
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{r_arrow}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{endash}65 km altitude and having minimum electron densities of 6{times}10{sup 4}{endash}10{sup 5}cm{sup {minus}3}. The source of the ionization is believed to be high-altitude discharges.{copyright} 1997 American Geophysical Union
- OSTI ID:
- 530065
- Journal Information:
- Journal of Geophysical Research, Journal Name: Journal of Geophysical Research Journal Issue: A3 Vol. 102; ISSN JGREA2; ISSN 0148-0227
- Country of Publication:
- United States
- Language:
- English
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