First observations of X-mode suppression of O-mode HF enhancements at 6300 Å

Details First observations of X-mode suppression of O-mode HF enhancements at 6300 Å First observations of X-mode suppression of O-mode HF enhancements at 6300 Å

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3620102g&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 20, CiteID L20102

Physics

2

Ionosphere: Active Experiments, Radio Science: Ionospheric Physics (1240, 2400), Radio Science: Nonlinear Phenomena (4400, 7839)

Scientific paper

We present observations of radio induced optical emissions from a HAARP experiment with simultaneous transmission in X and O-mode. The additional transmission of X-mode with a frequency 700 kHz higher than the O-mode, reduces the enhancement of the 6300 Å emission. This suggests that the wave-plasma process that energizes the electrons, which excites oxygen to the O(1 D) state, is closely connected to the excitation of upper-hybrid waves, whose onset and initial growth are reduced by additional X-mode pumping.

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