The method of determination of the long-term trends in the F2 region independent of geomagnetic activity

Details The method of determination of the long-term trends in the F2 region independent of geomagnetic activity The method of determination of the long-term trends in the F2 region independent of geomagnetic activity

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002angeo..20..511d&link_type=abstract

Annales Geophysicae, vol. 20, Issue 4, pp.511-521

Physics

6

Scientific paper

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.

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