Ion transport in Titan's upper atmosphere

被引：42

作者：

Cui, J. ^{[1
]}

Galand, M. ^{[1
]}

Yelle, R. V. ^{[2
]}

Wahlund, J. -E. ^{[3
]}

Agren, K. ^{[3
]}

Waite, J. H., Jr. ^{[4
]}

Dougherty, M. K. ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Space & Atmospher Phys Grp, Dept Phys, London SW7 2BW, England

[2] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[3] Swedish Inst Space Phys, SE-75121 Uppsala, Sweden

[4] SW Res Inst, San Antonio, TX 78228 USA

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2010年 / 115卷

基金：

英国科学技术设施理事会;

关键词：

CASSINI ION; IONOSPHERE; VENUS; PLASMA; MODEL; SIMULATION; FLOW;

D O I：

10.1029/2009JA014563

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Based on a combined Cassini data set including Ion Neutral Mass Spectrometer, Radio Plasma Wave Science, and Magnetometer measurements made during nine close encounters of the Cassini spacecraft with Titan, we investigate the electron ( or total ion) distribution in the upper ionosphere of the satellite between 1250 and 1600 km. A comparison of the measured electron distribution with that in diffusive equilibrium suggests global ion escape from Titan with a total ion loss rate of similar to(1.7 +/- 0.4) x 10(25) s(-1). Significant diurnal variation in ion transport is implied by the data, characterized by ion outflow at the dayside and ion inflow at the nightside, especially below similar to 1400 km. This is interpreted as a result of day-to-night ion transport, with a horizontal transport rate estimated to be similar to(1.4 +/- 0.5) x 10(24) s(-1). Such an ion flow is likely to be an important source for Titan's nightside ionosphere, as proposed in Cui et al. [2009a].

引用

页数：12

共 43 条

[1] On magnetospheric electron impact ionisation and dynamics in Titan's ram-side and polar ionosphere - a Cassini case study [J].

Agren, K. ;

Wahlund, J. -E. ;

Modolo, R. ;

Lummerzheim, D. ;

Galand, M. ;

Mueller-Wodarg, I. ;

Canu, P. ;

Kurth, W. S. ;

Cravens, T. E. ;

Yelle, R. V. ;

Waite, J. H., Jr. ;

Coates, A. J. ;

Lewis, G. R. ;

Young, D. T. ;

Bertucci, C. ;

Dougherty, M. K. .

ANNALES GEOPHYSICAE, 2007, 25 (11) :2359-2369

[2]

AGREN K, 2009, PLAN SPACE IN PRESS

[3] Titan airglow spectra from Cassini Ultraviolet Imaging Spectrograph (UVIS): EUV analysis [J].

Ajello, Joseph M. ;

Stevens, Michael H. ;

Stewart, Ian ;

Larsen, Kristopher ;

Esposito, Larry ;

Colwell, Josh ;

McClintock, William ;

Holsclaw, Greg ;

Gustin, Jacques ;

Pryor, Wayne .

GEOPHYSICAL RESEARCH LETTERS, 2007, 34 (24)

[4] Detection of Titan's ionosphere from Voyager 1 radio occultation observations [J].

Bird, MK ;

Dutta-Roy, R ;

Asmar, SW ;

Rebold, TA .

ICARUS, 1997, 130 (02) :426-436

[5] EVIDENCE FOR DAY-TO-NIGHT ION-TRANSPORT AT LOW SOLAR-ACTIVITY IN THE VENUS PRE-DAWN IONOSPHERE [J].

BRANNON, JF ;

FOX, JL ;

PORTER, HS .

GEOPHYSICAL RESEARCH LETTERS, 1993, 20 (23) :2739-2742

[6] Model-data comparisons for Titan's nightside ionosphere [J].

Cravens, T. E. ;

Robertson, I. P. ;

Waite, J. H., Jr. ;

Yelle, R. V. ;

Vuitton, V. ;

Coates, A. J. ;

Wahlund, J. -E. ;

Agren, K. ;

Richard, M. S. ;

De La Haye, V. ;

Wellbrock, A. ;

Neubauer, F. M. .

ICARUS, 2009, 199 (01) :174-188

[7] Composition of titan's ionosphere [J].

Cravens, TE ;

Robertson, IP ;

Waite, JH ;

Yelle, RV ;

Kasprzak, WT ;

Keller, CN ;

Ledvina, SA ;

Niemann, HB ;

Luhmann, JG ;

McNutt, RL ;

Ip, WH ;

De La Haye, V ;

Mueller-Wodarg, I ;

Wahlund, JE ;

Anicich, VG ;

Vuitton, V .

GEOPHYSICAL RESEARCH LETTERS, 2006, 33 (07)

[8] Titan's ionosphere:: Model comparisons with Cassini Ta Data -: art. no. L12108 [J].

Cravens, TE ;

Robertson, IP ;

Clark, J ;

Wahlund, JE ;

Waite, JH ;

Ledvina, SA ;

Niemann, HB ;

Yelle, RV ;

Kasprzak, WT ;

Luhmann, JG ;

McNutt, RL ;

Ip, WH ;

De La Haye, V ;

Müller-Wodarg, I ;

Young, DT ;

Coates, AJ .

GEOPHYSICAL RESEARCH LETTERS, 2005, 32 (12) :1-5

[9] A TWO-DIMENSIONAL MODEL OF THE IONOSPHERE OF VENUS [J].

CRAVENS, TE ;

CRAWFORD, SL ;

NAGY, AF ;

GOMBOSI, TI .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1983, 88 (NA7) :5595-5606

[10] Diurnal variations of Titan's ionosphere [J].

Cui, J. ;

Galand, M. ;

Yelle, R. V. ;

Vuitton, V. ;

Wahlund, J. -E. ;

Lavvas, P. P. ;

Mueller-Wodarg, I. C. F. ;

Cravens, T. E. ;

Kasprzak, W. T. ;

Waite, J. H., Jr. .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2009, 114

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