HR: 15:05h
AN: SA33C-05    [Abstracts]
TI: Magnus Force in the Dawnward Displacement of the Venus Transterminator Ionospheric Flow
AU: * Perez-de-Tejada, H
EM: perezdet@geofisica.unam.mx
AF: Institute of Geophysics, Ciudad Universitaria, Mexico, DF 04510, Mexico
AU: Lundin, R
EM: rickard@irf.se
AF: Swedish Institute of Space Physics, P. O. Box 812, Kiruna, Sweden, S-981 28, Sweden
AB: An empirical value of the Magnus force coefficient suitable to conditions applicable to the Venus ionosphere is derived by comparing the dawnward displacement of the Venus trans-terminator ionospheric flow expected from the Magnus force with that implied from the PVO measurements. The Magnus force is produced by a pressure difference that is set across that planet by the different speed that results when the rotation motion of the ionosphere and the trans-terminator flow are in the same sense (dusk side terminator) and that where both motions are opposite to each other (dawn side terminator). The Magnus force coefficient is inferred by using measured values of the parameters involved in the Magnus force equation (density and rotation frequency of the Venus upper ionosphere together with the speed and the dawnward deflection of the trans-terminator flow downstream from that planet) and leads to values of the Reynolds number that would be representative in comparable fluid dynamic problems.
DE: 5405 Atmospheres (0343, 1060)
DE: 5435 Ionospheres (2459)
DE: 5440 Magnetic fields and magnetism
DE: 5462 Polar regions
DE: 5499 General or miscellaneous
SC: SPA-Aeronomy [SA]
MN: 2007 Joint Assembly