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Cassini
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Intranet
| INSTITUTET FÖR RYMDFYSIK | UPPSALA |
 |
|
| Swedish Institute of Space Physics | (59°50.272′N, 17°38.786′E) |
Project work /
Examensarbete (30 hp)
Solar UV
characteristics from Cassini Langmuir probe measurements
Student: Madeleine Holmberg,
Uppsala UniversitySupervisors: Jan-Erik Wahlund, Michiko Morooka
Period: Spring 2009
Background
The Swedish Institute for Space Physics in Uppsala is responsible for the operation and dataanalysis of one instrument, a Langmuir probe, on board the international spacecraft Cassini
now orbiting Saturn. The examination project concerns the analysis of data from this
instrument.
Project
Use the Langmuir Probe analysis tools to derive the photoelectron current from the Langmuirprobe current characteristics from several years of database around Saturn that exist up to date.
The photoelectron current emitted from the probe gives an artefact in the data that need be
deducted from the data before analysis. This artefact is a current contribution from the boom
element, and depends on the spacecraft attitude with respect to the Sun. The corrected
photocurrent will then be calibrated to the solar F10.7 intensity (measured at Earth). Another
consideration is the ion current that may be finite in the solar wind data. If so, that current
contribution will be an estimate of the ion flux in the solar wind, which is also a wanted
parameter.
Report
Determination of Solar EUV Intensity and Ion Flux from Langmuir Probe Current Characteristics![[Rosetta]](../2006_mikael_lundberg/soi.jpg)
Cassini at Saturn.