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First observations of X‐mode suppression of O‐mode HF enhancements at 6300 Å
Author(s) -
Gustavsson B.,
Newsome R.,
Leyser T. B.,
Kosch M. J.,
Norin L.,
McCarrick M.,
Pedersen T.,
Watkins B. J.
Publication year - 2009
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2009gl039421
Subject(s) - mode (computer interface) , excitation , physics , electron , transmission (telecommunications) , atomic physics , plasma , optics , telecommunications , nuclear physics , quantum mechanics , computer science , operating system
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.