Mathematics – Logic
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm32a0806o&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM32A-0806
Mathematics
Logic
2736 Magnetosphere/Ionosphere Interactions
Scientific paper
Amplitude of magnetic pulsations observed on the ground can be expressed by B=A F(MLT) f(LT) σ where A is amplitude of source wave, F(MLT) shows MLT dependence of amplitude, f(LT) is a function of ionospheric conductivities at local time of station, and σ is a geological factor at station. In order to clarify F(MLT) and f(LT) of Pc 4 pulsations observed at the Circum-pan Pacific Magnetometer Network (CPMN) conjugate stations, we analyzed the CPMN magnetic data at Chokurdakh (CHD; M.lat.=64.67 deg.,M.lon.=212.12 deg., L=5.46), Kotzebue (KOT; 64.52, 249.72, 5.40), and Macquarie Isl. (MCQ; -64.50, 247.84, 5.40) during the interval of 15 - 17 September, 1994. Contaminated information of F(MLT) and f(LT) can be distributed by estimate the power ratio of CHD-KOT and CHD-MCQ. If we use the magnetic stations in the one-hemisphere, it is difficult to separate F(MLT) and f(LT). However, if we can analyzed data from the magnetic conjugate stations, the f(LT) can be extracted from the observed data, because F(MLT) at the conjugate points must be almost the same. From the analysis, the following results are obtained. (1) The F(MLT) of Pc 4 shows maximum in the prenoon sector and minimum in the afternoon sector. The maximum power is more than 3 times stronger than the minimum power. (2) The f(LT) of Pc 4 has the maximum around 6 and 18 LT, and minimum around 12 LT. The maximum power is 1.59 times stronger than the minimum power. In the present paper, we will compare the F(MLT) of Pc 4 on the ground and in space, and also discuss the LT dependence of obtained f(LT) on the ground.
Fraser Brian J.
Morris James R.
Obana Yuki
Olson John V.
Solovyev Stepan I.
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