Ordinary mode auroral kilometric radiation, with harmonics, observed by ISIS 1
Article first published online: 7 DEC 2012
This paper is not subject to U.S. copyright. Published in 1984 by the American Geophysical Union.
Volume 19, Issue 2, pages 543–550, March-April 1984
How to Cite
1984), Ordinary mode auroral kilometric radiation, with harmonics, observed by ISIS 1, Radio Sci., 19(2), 543–550, doi:10.1029/RS019i002p00543.(
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 19 AUG 1983
- Manuscript Received: 3 MAR 1983
ISIS 1 topside sounder receiver observations that reveal examples of O mode auroral kilometric radiation (AKR) are presented. They correspond to locations outside the low-density source region of intense AKR X mode emission. The propagation modes are identified by comparing the natural radiation wave cutoffs with the local resonant and wave cutoff phenomena stimulated by the sounder transmitter. The O mode AKR is the dominant emission in these regions of relatively high electron density, but it is considerably weaker than the intense X mode AKR observed to emanate from low-density cavities above the auroral regions. In addition to the fundamental O mode, second and third harmonic bands of radiation have also been detected. These harmonics associated with O mode AKR are less intense than the harmonics associated with X mode AKR. It is difficult to explain the variety of harmonic AKR observations (X as well as O mode) on the basis of present AKR theories.