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

被引：68

作者：

Agren, K. ^{[1
]}

Wahlund, J. -E. ^{[1
]}

Modolo, R. ^{[1
]}

Lummerzheim, D. ^{[2
]}

Galand, M. ^{[3
]}

Mueller-Wodarg, I. ^{[3
]}

Canu, P. ^{[4
]}

Kurth, W. S. ^{[5
]}

Cravens, T. E. ^{[6
]}

Yelle, R. V. ^{[7
]}

Waite, J. H., Jr. ^{[8
]}

Coates, A. J. ^{[9
]}

Lewis, G. R.

Young, D. T. ^{[10
]}

Bertucci, C. ^{[3
]}

Dougherty, M. K. ^{[3
]}

机构：

[1] Swedish Inst Space Phys, S-75121 Uppsala, Sweden

[2] Univ Alaska, Inst Geophys, Fairbanks, AK 99775 USA

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

[4] Inst Pierre Simon Laplace, CNRS, Ctr Etude Environm Terrestre & Planetaires, F-78140 Velizy Villacoublay, France

[5] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

[6] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA

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

[8] Univ Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48109 USA

[9] UCL, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England

[10] SW Res Inst, San Antonio, TX 78238 USA

来源：

ANNALES GEOPHYSICAE | 2007年 / 25卷 / 11期

基金：

英国科学技术设施理事会;

关键词：

ionosphere (Planetary ionospheres; Plasma; temperature and density); Magnetospheric physics Magnetosphere-ionosphere interactions);

D O I：

10.5194/angeo-25-2359-2007

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present data from the sixth Cassini flyby of Titan (T5), showing that the magnetosphere of Saturn strongly interacts with the moon's ionosphere and exo-ionosphere. A simple electron ionisation model provides a reasonable agreement with the altitude structure of the ionosphere. Furthermore, we suggest that the dense and cold exo-ionosphere (from the exobase at 1430 km and outward to several Titan radii from the surface) can be explained by magnetospheric forcing and other transport processes whereas exospheric ionisation by impacting low energy electrons seems to play a minor role.

引用

页码：2359 / 2369

页数：11

共 30 条

[1] Titan's magnetic field signature during the first Cassini encounter [J].

Backes, H ;

Neubauer, FM ;

Dougherty, MK ;

Achilleos, N ;

André, N ;

Arridge, CS ;

Bertucci, C ;

Jones, GH ;

Khurana, KK ;

Russell, CT ;

Wennmacher, A .

SCIENCE, 2005, 308 (5724) :992-995

[2] A coupled model of Titan's atmosphere and ionosphere [J].

Banaszkiewicz, M ;

Lara, LM ;

Rodrigo, R ;

López-Moreno, JJ ;

Molina-Cuberos, GJ .

ICARUS, 2000, 147 (02) :386-404

[3] Structure of the magnetic pileup boundary at Mars and Venus -: art. no. A01209 [J].

Bertucci, C ;

Mazelle, C ;

Acuña, MH ;

Russell, CT ;

Slavin, JA .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2005, 110 (A1)

[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] 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)

[6] 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

[7] IONOSPHERIC TEMPERATURE AND DENSITY-MEASUREMENTS BY MEANS OF SPHERICAL DOUBLE PROBES [J].

FAHLESON, U ;

FALTHAMMAR, CG ;

PEDERSEN, A .

PLANETARY AND SPACE SCIENCE, 1974, 22 (01) :41-66

[8] The ionosphere of Titan: Ideal diurnal and nocturnal cases [J].

Galand, M ;

Lilensten, J ;

Toublanc, D ;

Maurice, S .

ICARUS, 1999, 140 (01) :92-105

[9] Electron temperature of Titan's sunlit ionosphere [J].

Galand, M. ;

Yelle, R. V. ;

Coates, A. J. ;

Backes, H. ;

Wahlund, J. -E. .

GEOPHYSICAL RESEARCH LETTERS, 2006, 33 (21)

[10] The Cassini radio and plasma wave investigation [J].

Gurnett, DA ;

Kurth, WS ;

Kirchner, DL ;

Hospodarsky, GB ;

Averkamp, TF ;

Zarka, P ;

Lecacheux, A ;

Manning, R ;

Roux, A ;

Canu, P ;

Cornilleau-Wehrlin, N ;

Galopeau, P ;

Meyer, A ;

Boström, R ;

Gustafsson, G ;

Wahlund, JE ;

Åhlen, L ;

Rucker, HO ;

Ladreiter, HP ;

Macher, W ;

Woolliscroft, LJC ;

Alleyne, H ;

Kaiser, ML ;

Desch, MD ;

Farrell, WM ;

Harvey, CC ;

Louarn, P ;

Kellogg, PJ ;

Goetz, K ;

Pedersen, A .

SPACE SCIENCE REVIEWS, 2004, 114 (1-4) :395-463

← 1 2 3 →