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EP: Extraterrestrische Physik
EP 4: Magnetosph
ären und Plasmen
EP 4.4: Talk
Wednesday, March 22, 2000, 11:30–11:45, S3121
Peculiarities of a slow-mode wave structure in the solar wind — •C.-V. Meister3, M.I. Pudovkin1, A.A. Lubchich2, S.A. Zaitseva1, and B.P. Besser4 — 1St. Petersburg Univ. — 2Polar Geomagnetic Inst. Apatity — 3Astrophysical Inst. Potsdam — 4Inst. for Space Res. Graz
A wave structure observed onboard the IMP-8 satellite in the solar wind on December 17, 1990 is discussed, and it is found that this structure is associated with a slow-mode magnetosonic wave. The parameters of the wave such as the direction of the wave vector, the wave frequency and the decrement of attenuation are estimated. It is shown that the peculiarities of the plasma motion in the wave may provide conditions corresponding to an effective adiabatic index less than unity. The variations of the proton density and temperature are analyzed. It proved that during the entire time interval when the wave structure passed the earth, the value of the adiabatic index was less than unity. Thus, a special relationship between the value of the temperature anisotropy of the plasma and the particle convection existed. This is in accordance with theoretical predictions by Pudovkin et al. [J. Geophys. Res., 102, 27145-27149, 1997; Astr. Nachr., 320, 87-93, 1999].