Far Ultraviolet Imager / Geocorona Photometer
To measure the hydrogen Lyman-alpha emission of the neutral atmosphere
Three photometers operating over the H Lyman-alpha wavelength (121.6 nm), with an additional O2 gas cell providing an excellent throughput of the hydrogen radiation and simultaneously rejecting the photons at 130.4 nm from excited neutral oxygen. The temporal resolution between two complete measurements around 360º is 120 s.
Associated to FUV / WCI (Wideband Imaging Camera and FUV / SI (Spectrographic Imager)
Volumetric exploration of the magnetosphere as the satellite moves along the polar Highly Eliptical Orbit. The three photometers have fields of view of 1º x 1º looking into three different directions perpendicular to the spin axis of the satellite and tilted by ±28º.
Coverage / Cycle
Full interplanetary space including the magnetosphere at 2-min intervals
Flown on an R&D satellite
2000 to 2005-12-15
Satellites this instrument is flying on
Note: a red tag indicates satellites no longer operational, a
green tag indicates operational satellites, a blue tag indicates
Solar and space environment monitors Space radiometer or spectrometer
No WIGOS subcomponents have been defined.
Tentative Evaluation of Measurements
The following list indicates which measurements can
retrieved from this category of instrument. To see a full Gap Analysis by Variable,
click on the respective variable.
Note: table can be sorted by clicking on the column headers
Variable Relevance for measuring this variable Operational limitations Explanation
Heliospheric image 3 - high No specific limitation. Interplanetary space viewing in the H-Lyman-alpha line (121.6 nm)