Daytime midlatitude D region parameters at solar minimum from short-path VLF phase and amplitude

Details Daytime midlatitude D region parameters at solar minimum from short-path VLF phase and amplitude Daytime midlatitude D region parameters at solar minimum from short-path VLF phase and amplitude

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11603310t&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A3, CiteID A03310

Physics

2

Ionosphere: Modeling And Forecasting, Ionosphere: Solar Radiation And Cosmic Ray Effects, Ionosphere: Midlatitude Ionosphere, Radio Science: Ionospheric Physics (1240, 2400), Radio Science: Instruments And Techniques (1241)

Scientific paper

Observed phases and amplitudes of VLF radio signals propagating on a short (˜360 km) path are used to find improved parameters for the lowest edge of the (D region of the) Earth's ionosphere at a geomagnetic latitude of ˜53.5° in midsummer near solar minimum. The phases, relative to GPS 1 s pulses, and the amplitudes were measured both near (˜110 km from) the transmitter, where the direct ground wave is very dominant, and at distances of ˜360 km near where the ionospherically reflected waves form a (modal) minimum with the (direct) ground wave. The signals came from the 24.0 kHz transmitter, NAA, on the coast of Maine near the U.S.-Canada border, propagating ˜360 km E-NE, mainly over the sea, to Saint John and Prince Edward Island. The bottom edge of the midday, midsummer, ionosphere at ˜53.5° geomagnetic latitude was thus found to be well modeled by H′ = 71.8 ± 0.6 km and β = 0.335 ± 0.025 km-1 where H′ and β are Wait's traditional height and sharpness parameters used by the U.S. Navy in their Earth-ionosphere VLF radio waveguide programs. The variation of β with latitude is also estimated with the aid of interpolation using measured galactic cosmic ray fluxes.

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