Structure of ULF Pc3 waves in the Upper Ionosphere: Observations and a Model

Details Structure of ULF Pc3 waves in the Upper Ionosphere: Observations and a Model Structure of ULF Pc3 waves in the Upper Ionosphere: Observations and a Model

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm31d..03p&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SM31D-03

Computer Science

Sound

2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2752 Mhd Waves And Instabilities (2149, 6050, 7836)

Scientific paper

Recent low-orbiting observations by satellites with highly sensitive magnetic measurements (Orsted, CHAMP, ST-5) have provided a detailed picture of the Pc3 wave structure in the topside ionosphere. Pc3 waves in space were detected very clearly in the compressional component of the satellite magnetic field data, whereas in ground magnetometer data, their signature was found in the H component. The occurrence of a significant compressional component in Pc3 pulsations in the top-side ionosphere was also evidenced by radio-sounding measurements of ionospheric plasma oscillations. We consider the following two possibilities for ULF compressional disturbance excitation: (a) The incident Alfven wave upon interaction with the anisotropically conducting ionosphere generates an evanescent fast compressional mode; and (b) The transport of ULF wave energy from a distant source towards the ionosphere predominantly occurs by a fast compressional mode. We have developed an analytical-numerical model of the magnetosphere-ionosphere-atmosphere-ground system which enables one to estimate quantitatively the expected relationship between the Pc3 wave magnetic components above the ionosphere and on the ground produced by these two different mechanisms. The results of the model are applied to the interpretation of observations of Pc3 waves by satellites in the upper ionosphere and by mid-latitude ground stations.

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