TY - JOUR
T1 - Dynamics of Titan's thermosphere
AU - Rishbeth, H.
AU - Yelle, R. V.
AU - Mendillo, M.
N1 - Funding Information:
H. Rishbeth thanks the Center for Space Physics, Boston University, for hospitality. R. V. Yelle acknowledges support from NASA grant NAG5-4426. We are grateful to I. C. F. Müller-Wodarg and T. J. Fuller-Rowell for useful comments on our draft.
PY - 2000/1
Y1 - 2000/1
N2 - We estimate the wind speeds in Titan's thermosphere by considering the various terms of the wind equation, without actually solving it, with a view to anticipating what might be observed by the Cassini spacecraft in 2004. The winds, which are driven by horizontal pressure gradients produced by solar heating, are controlled in the Earth's thermosphere by ion-drag and coriolis force, but in Titan's thermosphere they are mainly controlled by the nonlinear advection and curvature forces. Assuming a day night temperature difference of 20 K, we find that Titan's thermospheric wind speed is typically 60 m s-1. In contrast, the Earth's thermospheric winds, of order 50 m s-1, do not equalize day and night temperatures. We speculate on other factors, such as the electrodynamics of Titan's thermosphere and the tides due to Saturn.
AB - We estimate the wind speeds in Titan's thermosphere by considering the various terms of the wind equation, without actually solving it, with a view to anticipating what might be observed by the Cassini spacecraft in 2004. The winds, which are driven by horizontal pressure gradients produced by solar heating, are controlled in the Earth's thermosphere by ion-drag and coriolis force, but in Titan's thermosphere they are mainly controlled by the nonlinear advection and curvature forces. Assuming a day night temperature difference of 20 K, we find that Titan's thermospheric wind speed is typically 60 m s-1. In contrast, the Earth's thermospheric winds, of order 50 m s-1, do not equalize day and night temperatures. We speculate on other factors, such as the electrodynamics of Titan's thermosphere and the tides due to Saturn.
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U2 - 10.1016/s0032-0633(99)00076-8
DO - 10.1016/s0032-0633(99)00076-8
M3 - Article
AN - SCOPUS:0001784038
SN - 0032-0633
VL - 48
SP - 51
EP - 58
JO - Planetary and Space Science
JF - Planetary and Space Science
IS - 1
ER -