The relationship between the IMF BY and the distant tail (150-238 Re) lobe and plasmasheet BY fields
B. T. Tsurutani, D. E. Jones, R. P. Lepping, E. J. Smith. D. G. Sibeck
Jet Propulsion Laboratory, C. I. T., Pasadena, CA 91109
Abstract:
The relationships between the Solar Magnetospheric (SM) y-component of the interplanetary magnetic field (IMF) and the lobe and plasmasheet magnetic fields have been studied for the two ISEE-3 deep tail passes. It is found that for positive sector IMFs, 13% of the interplanetary magnetic field penetrates into the aberrated north-dawn and south-dusk lobe quadrants, and about the same amount in the north-dusk and south-dawn lobe quadrants for negative sector IMFs. The former results are generally consistent with open magnetospheric models, but the latter (the lack of response in certain quadrants) are unexplained by theory at this time. If the magnitude of the plasmasheet By fields are related to plasma pressure anisotropies, very small anisotropies of P^ /Pê ê » 1.01 are expected.
Geophys. Res. Lett., 11, No. 10, 1082-1085, Oct. 1984