Detection of Magnetospherically Ducted VLF Signals Geomagnetically Conjugate to a Russian Alpha Transmitter at L=1.9

Details Detection of Magnetospherically Ducted VLF Signals Geomagnetically Conjugate to a Russian Alpha Transmitter at L=1.9 Detection of Magnetospherically Ducted VLF Signals Geomagnetically Conjugate to a Russian Alpha Transmitter at L=1.9

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm22a..02c&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM22A-02

Physics

[2700] Magnetospheric Physics, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts

Scientific paper

The Russian 'Alpha' transmitters broadcast alternating pulses between 11-15 kHz for navigation. A fraction of the VLF energy escapes into the magnetosphere, is guided by ducts, amplified by interaction with radiation belt particles, and observed at the geomagnetic conjugate point. We analyze VLF data from Adelaide, Australia, conjugate to the Komsomolsk transmitter. An automated detection scheme separates the subionospheric and magnetospheric signals. We track availability of ducts at L=1.9 and find them present often. We connect the ground signal to the signal observed by the DEMETER spacecraft, which also observe triggered emissions and spectral broadening. We correlate to geomagnetic conditions to assess the role of wave growth and triggering from wave-particle interactions. We also find a strong diurnal variation in the magnetospheric signal, and apply a full-wave model of transionospheric propagation to include the effects of ionospheric absorption on both ends.

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