 |
| Titel |
The method of determination of the long-term trends in the F2 region independent of geomagnetic activity |
| VerfasserIn |
A. D. Danilov |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 20, no. 4 ; Nr. 20, no. 4, S.511-521 |
| Datensatznummer |
250014383
|
| Publikation (Nr.) |
 copernicus.org/angeo-20-511-2002.pdf |
|
|
|
|
|
| Zusammenfassung |
A detailed analysis of
the f oF2 data at the Sverdlovsk station is performed to answer the question:
whether the long-term trends of the F2-layer parameter detected recently are
mainly due to the long-term changes in geomagnetic activity during the recent
decades. Two methods to derive trends independent of geomagnetic activity are
developed. It is found that both methods agree well and give a relative
nongeomagnetic trend of about - 0.0015 per year (or an absolute nongeomagnetic
trend of about - 0.015 MHz per year). The close relation of foF2 to Ap
found by several authors is mainly due to a high correlation between the foF2
deviations from the regression line and year-to-year changes in the Ap
index rather than to systematic long-term changes of Ap as has been
suggested earlier.
Key words. Ionosphere (ionospheric
distances; modeling and forecasting) |
| |
|
| Teil von |
|
|
|
|
|
|
|