Wood, AG;
Pryse, SE;
Grande, M;
Whittaker, IC;
Coates, AJ;
Husband, K;
Baumjohann, W;
... Wurz, P; + view all
(2012)
The transterminator ion flow at Venus at solar minimum.
Planetary and Space Science
, 73
(1)
341 - 346.
10.1016/j.pss.2012.08.006.
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Abstract
The transterminator ion flow in the Venusian ionosphere is observed at solar minimum for the first time. Such a flow, which transports ions from the day to the nightside, has been observed previously around solar maximum. At solar minimum this transport process is severely inhibited by the lower altitude of the ionopause. The observations presented were those made of the Venusian ionospheric plasma by the ASPERA-4 experiment onboard the Venus Express spacecraft, and which constitute the first extensive in-situ measurements of the plasma near solar minimum. Observations near the terminator of the energies of ions of ionospheric origin showed asymmetry between the noon and midnight sectors, which indicated an antisunward ion flow with a velocity of (2.5±1.5) km s−1. It is suggested that this ion flow contributes to maintaining the nightside ionosphere near the terminator region at solar minimum. The interpretation of the result was reinforced by observed asymmetries in the ion number counts. The observed dawn–dusk asymmetry was consistent with a nightward transport of ions while the noon–midnight observations indicated that the flow was highly variable but could contribute to the maintenance of the nightside ionosphere.
| Type: | Article |
|---|---|
| Title: | The transterminator ion flow at Venus at solar minimum |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.pss.2012.08.006 |
| Publisher version: | http://dx.doi.org/10.1016/j.pss.2012.08.006 |
| Language: | English |
| Additional information: | This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1380563 |
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