Wright, J.W.; Kopka, H.; Stubbe, P.. 1988 A large-scale ionospheric depletion by intense radio wave heating. Geophysical Research Letters, 15 (13). 1531-1533. 10.1029/GL015i013p01531
A large (100 km N/S), stable, smoothly‐structured and significant depletion (15% in number density) of the daytime Tromsø F‐region was produced inadvertently during a Heater polarisation and beam‐forming procedure. We show that the depletion coincided with the passage of an atmospheric gravity wave of natural origin which served as a large‐scale ‘seed‘ depletion for the self‐focussing instability
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