Simultaneous observations of VLF ground transmitter signals on the DE 1 and COSMOS 1809 satellites: Detection of a magnetospheric caustic and a duct
Journal Article
·
· Journal of Geophysical Research
- Stanford Univ., CA (United States); and others
Khabarovsk transmitter signals (15.0 kHz, 48{degrees}N, 135{degrees}E) were observed on the high-latitude ({approximately}15000 km) Dynamic Explorer 1 (DE 1) and the low-altitude ({approximately}960) km COSMOS 1809 satellites during a 9-day period in August 1989. On 7 out of 9 days the linear wave receiver (LWR) on the DE 1 satellite detected signals from the Khabarovsk transmitter. On two days, August 23 and 27, 1989, observations of the Khabarovsk transmitter signals were simultaneously carried out at high altitude on the DE 1 satellite and at low altitude on the COSMOS 1809 satellite. Analysis of data from these 2 days has led to several new results on the propagation of whistler mode signals in the Earth`s magnetosphere. New evidence was found of previously reported propagation phenomena, such as (1) confinement of transmitter signals in the conjugate hemisphere at ionospheric heights ({approximately} 1000 km), (2) observation of direct multipath propagation on both DE 1 and COSMOS 1809, (3) detection of ionospheric irregularities of {le} 100 km scale size with a few percent enhancement in electron density, believed to be responsible for the observed multipath propagation. The authors report the first detection of an exterior caustic surface near L {approximately} 3.5 for VLF ground transmitter signals injected into the magnetosphere; the location of the caustic surface depended on the signal frequency, and the electric and magnetic fields decreased by several hundred decibels per L shell in the dark (shadow) side of the caustic. The authors also report the first direct detection of a magnetospheric duct as L = 2.94 which was believed to be responsible for the ducted propagation of Khabarovsk signals observed on the COSMOS 1809 satellite; the measured duct parameters were {Delta}L{approximately} 0.06 and {Delta}N{sub e}{approximately}10 -13%. 54 refs., 8 figs. 3 tabs.
- OSTI ID:
- 166275
- Journal Information:
- Journal of Geophysical Research, Journal Name: Journal of Geophysical Research Journal Issue: A9 Vol. 99; ISSN JGREA2; ISSN 0148-0227
- Country of Publication:
- United States
- Language:
- English
Similar Records
Exos-B/Siple Station VLF wave-particle interaction experiments 2. Transmitter signals and associated emissions
Lightning-induced coupling of the radiation belts to geomagnetically conjugate ionospheric regions
Excitation of whistler mode signals via injection of polarized VLF waves with the Siple transmitter
Journal Article
·
Fri Dec 31 23:00:00 EST 1982
· J. Geophys. Res.; (United States)
·
OSTI ID:6079150
Lightning-induced coupling of the radiation belts to geomagnetically conjugate ionospheric regions
Thesis/Dissertation
·
Thu Dec 31 23:00:00 EST 1992
·
OSTI ID:7264477
Excitation of whistler mode signals via injection of polarized VLF waves with the Siple transmitter
Journal Article
·
Fri Jan 31 23:00:00 EST 1992
· Radio Science; (United States)
·
OSTI ID:5399263