 |
| Titel |
First electron density and temperature estimates from the Swarm Langmuir probes and a comparison with IS measurements |
| VerfasserIn |
Stephan C. Buchert, Anders Eriksson, Reine Gill, Thomas Nilsson, Lennart Åhlen, Jan-Erik Wahlund, David Knudsen, Johnathan Burchill, William Archer, Alexei Kouznetsov, Nico Stricker, Abderrazak Bouridah, Ralph Bock, Ingemar Häggström, Michael Rietveld, Sixto Gonzalez, Nestor Aponte |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250096943
|
| Publikation (Nr.) |
 EGU/EGU2014-12479.pdf |
|
|
|
|
|
| Zusammenfassung |
| The Langmuir Probes (LP) on the Swarm satellites are part of the Electric Field Instruments (EFI), which are featuring thermal ion imagers (TII) and so are measuring 3-d ion distributions. The main task of the Langmuir probes is to provide measurements of spacecraft potentials influencing the ions before they enter the TIIs. In addition also electron density (Ne) and temperature (Te) are estimated from EFI LP data. The design of the Swarm LP includes a standard current sampling under sweeps of the bias voltage, and also a novel ripple technique yielding derivatives of the current-voltage characteristics at three points in a rapid cycle. In normal mode the time resolution of the Ne and Te measurements so becomes only 0.5 s.
We show first Ne and Te estimates from the EFI LPs obtained in the commissioning phase in December 2013, when all three satellites were following each other at about 500 km altitude at mutual distances of a few tens of kilometers. The LP data are compared with observations by incoherent scatter radars, namely EISCAT UHF, VHF, the ESR, and also Arecibo.
Acknowledgements: The EFIs were developed and built by a consortium that includes COM DEV Canada, the University of Calgary, and the Swedish Institute for Space Physics in Uppsala. The Swarm EFI project is
managed and funded by the European Space Agency with additional funding from the Canadian Space Agency. EISCAT is an international association supported by research organisations in China (CRIRP), Finland (SA), Japan (NIPR and STEL), Norway (NFR), Sweden (VR), and the United Kingdom (NERC). The Arecibo Observatory is operated by SRI International under a cooperative agreement with the National Science Foundation (AST-1100968), and in alliance with Ana G. Méndez-Universidad Metropolitana, and the Universities Space Research Association. |
|
|
|
|
|
|