ISEE 1 and 2 OBSERVATION of the SPATIAL STRUCTURE of a COMPRESSIONAL Pc5 WAVE
GEOPHYSICALRESEARCH LETTERS, VOL. 12, NO. 9, PAGES 613-616, SEPTEMBER1985 ISEE 1 AND 2 OBSERVATION OF THE SPATIAL STRUCTURE OF A COMPRESSIONAL Pc5 WAVE Ka zue Takahashi University of California, Los Alamos National Laboratory ChristopherT. Russell1 Institute of Geophysics and Planetary Physics, University of California Los Angeles Roger R. Anderson Department of Physics and Astronomy, The University of Iowa Abstract. A compressional Pc5 wave was [Russell, 1978]. The da•taare presented in a observed on an ISEE 1 and 2 outbound path on coordinate system where H (9orth) is antiparallel September 28, 1981 at L = 5.6-7.3 near the •to t•he ge•omagneticdipole, D is eastward and magnetic equator at ~10 hr local time during the V = D x H is approximately radially outward. Note recovery phase of a geomagnetic storm. The wave that only deviations from the Olson-Pfizer model propagated westward with a large azimuthal wave field [Olson and Pfttzer, 1977] are plotted. The number of ~30 and exhibited in-phase oscillations total component (not plotted) is essentially the of plasma density and magnetic field magnitude. same as the H component. During this event, component-dependent variations The compressional Pc5 wave was present between in phase and amplitude were observed for the 0400 and 0510 UT. During this interval, the L magnetic field oscillations. The radial and value, local time, and magnetic latitude of the compressional components had a constant phase and satellite changed from (5.6, 0930, 8.2 ø) to (7.3, their amplitude was finite. In contrast, the 1010, 1.9ø). Throughout the wave event the V azimuthal component changed its phase by 180ø and component oscillated without any phase variation its amplitude became zero during the middle of the and had a period of ~400 s.
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