The spectrum of LF/MF/HF radio noise at ground level during substorms
Article first published online: 7 DEC 2012
Copyright 1994 by the American Geophysical Union.
Geophysical Research Letters
Volume 21, Issue 24, pages 2749–2752, 1 December 1994
How to Cite
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 30 AUG 1994
- Manuscript Received: 21 JUL 1994
During the 1993–1994 Winter, simultaneous measurements were conducted in Alaska of the radio spectrum from 0.1 to 4.8 MHz and geomagnetic activity. Night-time geomagnetic disturbances, consisting of bays in the DC magnetic field and rapid variations recorded with the induction coil, were found to be correlated with prompt absorption features in the LF/MF/HF radio spectrum and with three types of natural emissions at LF/MF/HF frequencies. During February–March, 1994, 66 out of 73 magnetic signatures meeting certain criteria were associated with LF/MF/HF absorption events and 30 of the 73 were associated with natural emissions. The radio spectrum was sometimes observed to be sensitive to relatively weak magnetic activity.