THE CEOS DATABASE : Missions, Instruments and Measurements
CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
Measurements > Gravity and Magnetic Fields >
Gravity, Magnetic and Geodynamic measurements >
Electron Energy and Pitch Angle Distribution


Measurement Definition*: Electrons spiral around magnetic field lines, and their motion is described by their velocity along the local magnetic field and perpendicular to it. The pitch angle is derived from the ratio of those two velocities and can predict which electrons will precipitate in the ionosphere to produce the aurora and which will be reflected back along the magnetic field line.
InstrumentStatus/
Accuracy
Instrument DescriptionMeasurement TechnologyTimeline
HEPD
High Energy Particle Detector
Operational
Fluxes of electrons (3 - 100 MeV), protons (30 - 200 MeV) and light nuclei. Measurement of the increase of the electron and proton fluxes due to short-time perturbations of the radiation belts caused by solar, terrestrial and anthropic phenomena.n/a
SEI
Suprathermal Electron Imager
Operational
The SEI measures the electron energy and pitch angle distribution over the energy range of 1 to 200 eV, with particular emphasis on photoelectrons in the 1 to 50 eV range.n/a
* Description adapted from WMO.
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