Variance of transionospheric VLF wave power absorption

Details Variance of transionospheric VLF wave power absorption Variance of transionospheric VLF wave power absorption

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11507303t&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A7, CiteID A07303

Physics

2

Radio Science: Ionospheric Propagation (0689, 2487, 3285, 4275, 4455), Radio Science: Waves In Plasma (7867), Magnetospheric Physics: Numerical Modeling, Ionosphere: Wave/Particle Interactions (7867), Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431)

Scientific paper

To investigate the effects of D-region electron-density variance on wave power absorption, we calculate the power reduction of very low frequency (VLF) waves propagating through the ionosphere with a full wave method using the standard ionospheric model IRI and in situ observational data. We first verify the classic absorption curves of Helliwell's using our full wave code. Then we show that the IRI model gives overall smaller wave absorption compared with Helliwell's. Using D-region electron densities measured by rockets during the past 60 years, we demonstrate that the power absorption of VLF waves is subject to large variance, even though Helliwell's absorption curves are within ±1 standard deviation of absorption values calculated from data. Finally, we use a subset of the rocket data that are more representative of the D region of middle- and low-latitude VLF wave transmitters and show that the average quiet time wave absorption is smaller than that of Helliwell's by up to 100 dB at 20 kHz and 60 dB at 2 kHz, which would make the model-observation discrepancy shown by previous work even larger. This result suggests that additional processes may be needed to explain the discrepancy.

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