The solar cycle variability of lunar and solar daily geomagnetic variations

Details The solar cycle variability of lunar and solar daily geomagnetic variations The solar cycle variability of lunar and solar daily geomagnetic variations

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..254o&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 4, p. 254-262.

Physics

11

Diurnal Variations, Geomagnetic Pulsations, Ionospheric Conductivity, Solar Cycles, Sunspots, Dynamo Theory, Extreme Ultraviolet Radiation, Ionospheric Currents, Lunar Radiation, Solar Terrestrial Interactions

Scientific paper

Hourly mean values of the geomagnetic field from observatories between 6 deg dip latitude and 60 deg geomagnetic latitude are analyzed here for solar and lunar daily variations. A linear regression is evaluated to express the dependence of the external potential coefficients of the horizontal components S and L on the sunspot number R. The R-dependence of S is found to be about 2.5 times that of L and, as expected, the amplitudes increase with R for both S and L. When the sun is active, the foci of the equivalent currents are about 1/2 to 1 hr later in local time for S but earlier for L compared to their positions during quiet years.

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