Precipitation signatures of ground-based VLF transmitters

Details Precipitation signatures of ground-based VLF transmitters Precipitation signatures of ground-based VLF transmitters

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11307214k&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A7, CiteID A07214

Physics

8

Magnetospheric Physics: Energetic Particles: Precipitating, Ionosphere: Wave/Particle Interactions (7867), Radio Science: Waves In Plasma (7867), Magnetospheric Physics: Magnetosphere: Inner

Scientific paper

Numerical raytracing with Landau damping is used to calculate >100 keV electron precipitation signatures induced by hypothetical VLF transmitters distributed broadly in geomagnetic latitude and operating at a wide range of frequencies. A one-half second pulse from each source is simulated and attenuation to the base of the magnetosphere for geomagnetic latitudes from 10° to 60° is calculated. Source location affects induced precipitation more strongly than operating frequency or radiated power. Sources located at 35° to 45° induce the most >100 keV precipitation for the 10 to 40 kHz waves typical of ground-based VLF sources, while locations below λ $\simeq$ 15° or above λ $\simeq$ 55° are least effective at precipitating energetic electrons. In all cases, induced precipitation increases as the operating frequency decreases, with 10 kHz waves from a source at λ $\simeq$ 35° the most effective at precipitating >100 keV electrons. Precipitation signatures produced by five existing ground-based VLF transmitters are also simulated: the NAA, NLK, NAU, NPM, and NWC VLF transmitters. NWC induces the strongest >100 keV electron precipitation signature, followed by NPM, NAU, NAA, and NLK.

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