SPEE: Freja charging database - work package 100
We provide here an access to the database of spacecraft charging events detected during the operation of the Freja satellite. A total of 291 surface charging events have been detected. The Freja spacecraft is a polar orbiting spacecraft with an perigee near 600 km (above south pole area) and an apogee of about 1800 km (above the north polar area). The data set can be organized according to peak charging level, light conditions and charging duration as indicated below. Just select the physical conditions and a list of events will be displayed, select one of the events and the corresponding data will be displayed. For each event the following data is included:
- Spectrogram of HF emissions (30 kHz - 2 MHz)
- Langmuir probe current
- Ion (O+) data
- High energy (MATE) electron data (available before orbit 1600)
- Medium energy (TESP) electron data (available after orbit 730)
Note: After orbit 1600 the MATE data is only available as an integrated flux. Read the work package reports (WP100) carefully and take contact with the Swedish Institute of Space Physics, Uppsala, before using any of the data presented here. The data interpretation may be heavily dependent on instrumental capabilities and measurement mode types.
Plots are in the PDF format readable by the free Adobe Acrobat Reader. The reduced statistical database can be downloaded as an ascii file. The data are listed event for event with the follwing content:
orbit no
year
month
day
UT (hour, minutes, seconds)
Altitude [km]
CGLAT [degrees]
Longitude [degrees]
MLT
Peak charging level [V]
Event duration [s]
Sunlight conditions (Eclipse = 1, Sunlight = 0, Both = 2)
Electron density [m^-3]
Electron spectral type (TESP = 1, MATE = 2)
16 values of electron spectra
Have a charged look!
Spacecraft charging main page
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1.12. 1998 - ari.viljanen@fmi.fi
ESTEC contract 11974/96/NL/JG(SC) (*)