TY - JOUR
T1 - Exospheric heating by pickup ions at Titan
AU - Tseng, W. L.
AU - Ip, W. H.
AU - Kopp, A.
N1 - Funding Information:
We thank Drs. Esa Kallio and Ilkka Sillanpää for useful discussions, and the reviewers for constructional comments. This work was supported by the National Science Council of Taiwan under Grants NSC 94-2112-M-008-002, NSC 94-2111-M-008-033, and NSC 94-2111-M-008-001-PAE.
PY - 2008/7/1
Y1 - 2008/7/1
N2 - Titan has a very extensive atmosphere and exosphere which interact strongly with the corotating magnetospheric plasma. Some of the new pickup ions created in the vicinity of the exosphere will re-impact the upper atmosphere causing additional energy input. Previous investigations of the atmospheric collisional interaction of the pickup ions have generally assumed the atmosphere to be spherically symmetric. From the Voyager and Cassini observations, we know that the magnetic field configuration and plasma flow field is highly asymmetric. To study the possible spatial variation in the pickup ion influx, we have employed the plasma data of the three dimensional MHD simulation of Kopp and Ip [Kopp, A., Ip, W.-H. Asymmetric mass loading effect at Titan's ionosphere. J. Geophys. Res. 106, 8323-8332, 2001] to compute the trajectories of the pickup ions. In this work, we calculate the ion influx and energy deposit into Titan's exobase for the H2+, CH4+ and N2+ pickup ions separately. The model results of four different Titan's orbital locations are also presented.
AB - Titan has a very extensive atmosphere and exosphere which interact strongly with the corotating magnetospheric plasma. Some of the new pickup ions created in the vicinity of the exosphere will re-impact the upper atmosphere causing additional energy input. Previous investigations of the atmospheric collisional interaction of the pickup ions have generally assumed the atmosphere to be spherically symmetric. From the Voyager and Cassini observations, we know that the magnetic field configuration and plasma flow field is highly asymmetric. To study the possible spatial variation in the pickup ion influx, we have employed the plasma data of the three dimensional MHD simulation of Kopp and Ip [Kopp, A., Ip, W.-H. Asymmetric mass loading effect at Titan's ionosphere. J. Geophys. Res. 106, 8323-8332, 2001] to compute the trajectories of the pickup ions. In this work, we calculate the ion influx and energy deposit into Titan's exobase for the H2+, CH4+ and N2+ pickup ions separately. The model results of four different Titan's orbital locations are also presented.
KW - Atmospheric sputtering
KW - Exosphere
KW - Exospheric heating
KW - Pickup ions
KW - Titan
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U2 - 10.1016/j.asr.2008.03.009
DO - 10.1016/j.asr.2008.03.009
M3 - Article
AN - SCOPUS:43849100120
SN - 0273-1177
VL - 42
SP - 54
EP - 60
JO - Advances in Space Research
JF - Advances in Space Research
IS - 1
ER -