Solar electron fluxes, increased geomagnetic activity and ionospheric absorption following selected flares
Abstract
Investigations on the aftereffect in ionospheric absorption following selected solar flares are presented for the interval 1966-1969. By a superposed epoch analysis a significant aftereffect was detected in night absorption data at 245 kHz on the circuit Kalundborg/Denmark-Kuehlungsborn/GDR by using days of important flares (CFI 9-16) with intense electron fluxes (exceeding 40 keV) as key days. Further analyses have revealed some specific details, namely that the most outstanding aftereffects are related to central-zone flares (30 deg E-30 deg W) of high importance, even when the associated electron fluxes were lower than in the case of outer-zone 30-90-deg-W flares of similar importance. An inverse test has implicitly confirmed these results, and has also proved that not all of the intense geomagnetic disturbances are followed by a significant aftereffect.
- Publication:
-
Journal of Geophysics Zeitschrift Geophysik
- Pub Date:
- 1978
- Bibcode:
- 1978JGZG...45...91M
- Keywords:
-
- Electromagnetic Absorption;
- Geomagnetism;
- Ionospheric Propagation;
- Solar Electrons;
- Solar Flares;
- Solar Flux;
- Solar Terrestrial Interactions;
- Electron Flux Density;
- Electron Precipitation;
- Magnetic Disturbances;
- Solar Activity Effects;
- Statistical Analysis