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SuperDARN observations of spectral enhancements excited during an ionospheric heating experiment
Author(s) -
Hughes J. M.,
Bristow W. A.,
Parris R. T.
Publication year - 2004
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 - 10.1029/2004gl019613
Subject(s) - ionosphere , duty cycle , radar , range (aeronautics) , mode (computer interface) , excited state , atmospheric sciences , physics , computational physics , geology , geophysics , environmental science , remote sensing , materials science , atomic physics , computer science , telecommunications , power (physics) , quantum mechanics , composite material , operating system
Observations are reported of undocumented enhancements to the backscattered HF radar spectrum detected by the Kodiak SuperDARN radar during an O‐mode heating experiment conducted at the HAARP facility. A total of 27 enhancements were observed, each of which was statistically significant, well correlated with the heater duty cycle, and localized within the heated region above HAARP. Several enhancements are symmetrically spaced around the pump frequency while others occur near electron gyroharmonics. The enhancements are distributed over a frequency range of more than 6.5 MHz and may, we suggest, indicate the presence of Bernstein modes and upper hybrid oscillations stimulated by the HAARP heater.