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On the VHF radar echoes in the region of midnight aurora: Signs of ground echoes modulated by the ionosphere

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journal contribution
posted on 2015-07-23, 13:53 authored by A. Kozlovsky, Mark Lester
We present all-sky interferometric meteor radar (MR), VHF (36.9 MHz), observations from Sodankylä Geophysical Observatory and report on the unusual echoes, which were detected at low elevation on the northern horizon, typically during substorms. These echoes have a near-zero Doppler shift, relatively low power, but with a sharp rise to the power peak, short lifetime (less than 2 s), and nonexponential decay (NED). We suggest that such auroral NED echoes are in fact ground backscatter of the MR waves which have been refracted in the ionosphere, passing through the ionosphere in the substorm region, where pulsating aurora (at a frequency higher than 1.7 Hz) occurs and causes quasiperiodic modulation of the wave propagation conditions, which leads to corresponding modulation of the amplitude of return. The MR treats such oscillating signal as meteor trails.

Funding

M. L. acknowledges support from NERC grant NE/K011766/1.

History

Citation

Journal of Geophysical Research. Space Physics, 2015, 120 (3), pp. 2099-2109 (11)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • AM (Accepted Manuscript)

Published in

Journal of Geophysical Research. Space Physics

Publisher

Wiley-Blackwell, American Geophysical Union

issn

2169-9380

Acceptance date

2015-02-28

Copyright date

2015

Available date

2015-07-23

Publisher version

http://onlinelibrary.wiley.com/doi/10.1002/2014JA020715/abstract

Language

en

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