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DE‐1 observations of VLF transmitter signals and wave‐particle interactions in the magnetosphere
Author(s) -
Inan U. S.,
Helliwell R. A.
Publication year - 1982
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl009i009p00917
Subject(s) - magnetosphere , physics , satellite , transmitter , doppler effect , earth's magnetic field , geophysics , broadband , substorm , van allen radiation belt , ionosphere , radio wave , computational physics , magnetic field , telecommunications , astronomy , optics , channel (broadcasting) , quantum mechanics , computer science
A broadband VLF receiver on the DE‐1 satellite measures signals injected into the magnetosphere by ground‐based transmitters. VLF emissions triggered by these signals indicate that the waves interact strongly with trapped energetic particles in the magnetosphere. The propagation paths from the source to the satellite are deduced on the basis of the group time delay and Doppler shift. Although there are many different paths, emissions are triggered by the later‐arriving pulses that have traversed the geomagnetic equator. First satellite‐based observations of emission triggering by high‐power communications transmitters and their possible implications are discussed.