Ionospheric F2-Layer Semi-Annual Variation in Middle Latitude by Solar Activity

Details Ionospheric F2-Layer Semi-Annual Variation in Middle Latitude by Solar Activity Ionospheric F2-Layer Semi-Annual Variation in Middle Latitude by Solar Activity

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jass...27..319p&link_type=abstract

Journal of Astronomy and Space Sciences. Vol. 27, no. 4, 319-327

Astronomy and Astrophysics

Astronomy

Solar Activity, Middle Latitude, F2-Layer, Semi-Annual Variation, Geomagnetic Activity

Scientific paper

We examine the ionospheric F2-layer electron density variation by solar activity in middle latitude by using foF2 observed at the Kokubunji ionosonde station in Japan for the period from 1997 to 2008. The semi-annual variation of foF2 shows obviously in high solar activity (2000-2002) than low solar activity (2006-2008). It seems that variation of geomagnetic activity by solar activity influences on the semi-annual variation of the ionospheric F2-layer electron density. According to the Lomb-Scargle periodogram analysis of foF2 and Ap index, interplanetary magnetic field (IMF) Bs (IMF Bz <0) component, solar wind speed, solar wind number density and flow pressure which influence the geomagnetic activity, we examine how the geomagnetic activity affects the ionospheric F2-layer electron density variation. We find that the semi-annual variation of daily foF2, Ap index and IMF Bs appear clearly during the high solar activity. It suggests that the semi-annual variation of geomagnetic activity, caused by Russell-McPherron effect, contributes greatly to the ionospheric F2-layer semi-annual electron density variation, except dynamical effects in the thermosphere.

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