We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Drifting ELF/VLF Emissions Observed at Low Latitude Ground Station During Geomagnetic Storm.
- Authors
Singh, A.; Singh, Shubha; Singh, R.
- Abstract
We have reported for the first time total seven strong events of drifting ELF/VLF discrete emissions observed on 28th–29th April, 1990 in the pre-midnight sector at Varanasi (Geomag. lat. 14°55′N, long. 154°E, L = 1.07). The events exhibit a regular increasing as well as decreasing frequency drifts and are mainly discrete periodic emissions of riser, faller and hook types observed during a geomagnetic storm period, with minimum Dst-index −98 nT and K p-index ≥ 5. The frequency drift in ELF/VLF emissions at low latitudes seems to be a rare phenomenon. The repetition period and the frequency drift rate have been evaluated for all the recorded events. The frequency drifts have been interpreted in terms of a combined effect of L-shell drift of interacting energetic electrons and the change in convection electric fields during the storm developments. The computed maximum spectral power density $$ \left\langle {B_{f}^{2} } \right\rangle_{\max } $$of the wave varies between 1.8 × 10−21 and 4.08 × 10−22 Gauss2/Hz, whereas frequency drift rates are in agreement with the observed values.
- Subjects
GEOMAGNETISM; EARTH stations; VLF emissions; QUANTUM chemistry; ELECTRONS; FREQUENCY changers; ELECTRIC fields
- Publication
Earth, Moon & Planets, 2010, Vol 106, Issue 2-4, p119
- ISSN
0167-9295
- Publication type
Article
- DOI
10.1007/s11038-010-9353-4