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[en] The paper presents a summary of results on the comparison of pulsations data from the satellite ATS 6 and the surface station Nagycenk for a year in 1973-74. In spite of the difference in position and L-value, strong similarities were observed, and even a part of the existing differences could be explained in terms of the afternoon-activity unobservable on ground. Diurnal variation of short period pulsation amplitudes were detected. The dependence of observed pulsation characteristics on solar wind velocity are discussed. (D.Gy.)
[en] A comparison is made of results obtained at two widely separated observatories, Nagycenk in Hungary and Uzur in Soviet Siberia (both at geomagnetic latitude 48 deg) and the connection is studied between pulsation parameters and parameters of the interplanetary medium. It is concluded that, in spite of differences in recording and processing, the results are similar and confirm earlier suppositions about these connections. Hypotheses about the location of the excitation clearly favour the pre-shock interplanetary medium with reflected protons counterstreaming to the solar wind. Propagation through the shock wave and the magnetopause, as well as infra-magnetospheric propagation, may later alter certain parameters of the pulsations. (author)
[en] Complete text of publication follows. The dominant source of dayside pulsations at low-latitudes is inward propagating upstream wave activity. In this region pulsations due to upstream wave are clearly observed on the ground whereas at mid-latitudes they drive field line resonances that makes the wave structure more complex. In a joint Hungarian-US project, 1-Hz data from the USGS, Japanese, and Hungarian pulsation stations are used to examine Pc3 activity at low-latitudes. The Pc3 pulsations due to upstream waves will be used to develop an index for the characterization of the global activity of the upstream wave phenomena. The relationship between the index and cone angle of the interplanetary magnetic field is examined for a correlation with solar and/or magnetospheric activity. The conclusions may be essential to space weather conditions.