The vertical distribution of ionospheric disturbances during geomagnetic storms
Abstract
A complex synoptic analysis of the ionospheric effects of geomagnetic storms has been carried out in the area extending from the maximum night time F-region to the base of the planetary ionosphere. Data obtained from observations of the ionosphere during a year of geomagnetic storm activity in 1982 were used in the analysis. In more than 95 percent of storm occurrences, disturbances in the F-region were observed. The disturbances were distributed almost uniformly throughout five hour internals occurring at midnight, around noon, and at about 7:00 PM. It is shown that night time absorption at frequencies 1-2 MHz was directly related to the boundary frequency f(0)E sub s. The distribution of disturbances in the mean night time ionosphere was homogeneous for distances of 1000 km or more. The night time disturbances in the lower ionosphere were also observed having a delay of 1 or 2 days.
- Publication:
-
Bulgarsko Geofizichno Spisanie
- Pub Date:
- 1985
- Bibcode:
- 1985BlGSp..11...29N
- Keywords:
-
- F Region;
- Ionospheric Disturbances;
- Magnetic Storms;
- Sudden Storm Commencements;
- Vertical Distribution;
- Annual Variations;
- Cosmic Rays;
- Equatorial Regions;
- Night Sky