Effects of geomagnetic disturbances in power spectra of atmospheric waves in the dynamo region of the ionosphere

Details Effects of geomagnetic disturbances in power spectra of atmospheric waves in the dynamo region of the ionosphere Effects of geomagnetic disturbances in power spectra of atmospheric waves in the dynamo region of the ionosphere

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ge%26ae..49..247m&link_type=abstract

Geomagnetism and Aeronomy, Volume 49, Issue 2, pp.247-251

Computer Science

2

94.30.Lr, 94.20.Dg, 92.60.Hh

Scientific paper

The dynamics of wave disturbances in the ionospheric E region in the band of periods of thermal tidal waves and waves of planetary scales ( T = 48, 72, and 192 h) has been studied based on the variations in the horizontal component of the geomagnetic field, observed at Paratunka and Barrow observatories in September-October 1999. It has been found that, at midlatitudes during high geomagnetic activity, the intensity of oscillations in the power spectra with T = 24 and 12 h varies with a periodicity of 16 days different from the periodicity of changes in the Σ Kp index. The maximal deviations of these periods from the values under quiet conditions coincide with the maximal changes in the Σ Kp index. The variations in the 48-192 h band of periods (especially with T ˜192 h) intensify simultaneously with increasing geomagnetic activity. The intensity of this harmonic is several times as high as that of the harmonic with T ˜ 24 h. The periodicity of changes in the harmonics intensity within the 48-192 h band coincides with the periodicity of changes in the Σ Kp index. In the polar ionosphere, the effect of high geomagnetic activity is observed as an increase in the variations with a quasi-period of T ˜ 24 h and as an appearance of variations in the 48-192 h band with the periodicity coinciding with the maximums in the Σ Kp index variations.

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