Physics
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989angeo...7..387m&link_type=abstract
Annales Geophysicae (ISSN 0980-8752), vol. 7, Aug. 1989, p. 387-393.
Physics
4
Diurnal Variations, E Region, Geomagnetism, Ionospheric Currents, Magnetic Variations, Annual Variations, Fourier Analysis, Harmonic Analysis, Kp Index, Solar Cycles
Scientific paper
Declination and horizontal component of the geomagnetic field have been studied using the data of L'Aquila's Geomagnetic Observatory (a focus observatory). Two methods of analysis were used to investigate the S variation. (1) two full solar cycles from 1959 to 1981 had 2600 days with Ap of less than 7 and no Kp of greater than 2 intervals that were analyzed using a Fourier harmonic analysis on hourly means; and (2) all hourly mean values with no corrections from the 1960 to 1981 time period were input to a Chapman-Miller analysis which gives both S and L variations. While declination gives very small differences with the two methods, the horizontal component shows a remarkable difference. The comparison of the two methods can give information on the magnetosphere-ionosphere system. The possibility that rather irregular prevailing winds affect the H component daily variation is discussed.
Meloni Antonio
Molina Franco
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