Guide to the Freja charging database
The data set is 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 which
page of data you desire and the corresponding data will be displayed. For
each event the following data is included:
Page 1:
-
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)
Page 2:
-
Enlarged ion (O+) data
-
Eclipse/Sunlight conditions
-
Freja spin axis angle vs geomagnetic field direction
Sizes of PDF files are about 100-500 Kb. A description of how the
charging events have been identified can be found in the work package documentation
for WP110 and WP130.
They are readable by the free Adobe
Acrobat Reader.
Note: After orbit 1600 the MATE data is only available
as an integrated flux. Read the work package
reports 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. The reduced statistical database can be downloaded
as an ascii file. The data is listed event
for event with the following content:
orbit no
year
month
day
UT [hour, minutes, seconds] (at the peak of charging)
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 [cm^-2 s^-2 str^-1 eV^-1]
Freja spin axis angle vs. magnetic field direction [degrees]
Orbit number <-> UT converter
Have a charged look!
Freja charging main page
1999-07-15 - layout modified by tc@irfu.se
ESTEC contract 11974/96/NL/JG(SC) (*)