AbstractIn spite of many years of investigations of effects of geomagnetic storms on the F region ionosphere, still many open questions remain, one of them being the pre-storm enhancements of NmF2, the maximum electron concentration in the ionosphere. All 65 strong geomagnetic storms observed over the period 1995–2005 are analyzed as for the occurrence of the pre-storm enhancements over Europe using data of eight ionosonde stations covering European area. About 20–25% of storms are accompanied by sufficiently strong pre-storm enhancements. The pre-storm enhancements occur both day and night, more often in summer half of the year, do not exhibit a systematic latitudinal dependence, and are not accompanied by a corresponding change of hmF2. Several constraints for their mechanism were established, several potential sources were excluded, but the origin of pre-storm enhancements remains to be uncovered.
Pre-storm enhancements of foF2 above Europe
Advances in Space Research ; 39 , 8 ; 1298-1303
2007-03-01
6 pages
Article (Journal)
Electronic Resource
English
Pre-storm enhancements of foF2 above Europe
Online Contents | 2007
|On the Saturation of foF2 for R12 above 150
British Library Conference Proceedings | 1997
|Modeling the storm-time deviations of foF2 on a global scale
Online Contents | 2004
|Time and spatial variations of the foF2(night)/foF2(day) values
Elsevier | 2008
|