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| Titel |
G condition in the F2 region peak electron density: a statistical study |
| VerfasserIn |
V. V. Lobzin, A. V. Pavlov |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 20, no. 4 ; Nr. 20, no. 4, S.523-537 |
| Datensatznummer |
250014384
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| Publikation (Nr.) |
 copernicus.org/angeo-20-523-2002.pdf |
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| Zusammenfassung |
We present a study of
statistical relationships between the G condition, F1-layer and NmF2
negative disturbance occurrence probabilities and geomagnetic and solar
activity indices Kp and F10.7, season, and geomagnetic latitude, busing
experimental data acquired by the Ionospheric Digital Database of the National
Geophysical Data Center, Boulder, Colorado from 1957 to 1990. It is shown that
the dependence of the G condition occurrence probability, yG,
on Kp is mainly determined by processes that control the behaviour of
the F2 layer with Kp changes. We found that the relationship for log yG
versus Kp is very close to the linear one. The G condition occurrence
probability decreases from 0.55% to 0.17% as the value of F10.7 increases
from low to middle values, reaches its minimum at the middle solar activity
level of F10.7 = 144 – 170, increasing from the minimum value of 0.17% to
0.49% when the F10.7 index increases from the middle solar activity level to
F10.7 = 248 – 274. Interhemispheric asymmetry is found for the G condition
occurrence probability in the ionosphere, with a stronger enhancement seen in
the magnetic latitude range close to the northern magnetic pole and a deep
minimum of the G condition occurrence probability in the low magnetic latitude
range from – 30° to 30°. The measured magnetic latitude variation of the
F1-layer occurrence probability is also asymmetrical relative to the
geomagnetic equator. Our results provide additional evidence the F1-layer is
more likely to be formed in summer than in winter. The Northern Hemisphere peak
F1-layer occurrence probability is found to exceed that in the Southern
Hemisphere. The G condition occurrence probability has maximum values of 0.91
and 0.75% in summer, and minimum values of 0.01 and 0.05% in winter for the
Northern and Southern Hemisphere, respectively.
Key words. Ionosphere; ion
chemistry and composition; ionosphere-atmosphere interactions; ionospheric
disturbances |
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