The TESP electron spectrometer and correlator (F7) on Freja |
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| Authors: | M Boehm G Paschmann J Clemmons H Höfner R Frenzel M Ertl G Haerendel P Hill H Lauche L Eliasson R Lundin |
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| Institution: | (1) Max-Planck-Institute for Extraterrestrial Physics, D-85740 Garching, Germany;(2) Max-Planck-Institute for Aeronomy, Lindau, Germany;(3) Swedish Institute for Space Physics, Kiruna, Sweden |
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| Abstract: | The two-dimensional electron spectrometer onFreja consists of a  top-hat -type electrostatic analyzer with the addition of entrance aperture deflection plates. The field of view of the concentric-hemisphere analyzer is modified from a plane to a cone up to 25° from this plane by application of bipolar high voltages to the deflection plates. Fast high-voltage sweeps allow full 10 eV–25 KeV, 500-point distribution function measurements in 32 ms. Constant-energy or limited energy-sweep modes allow time resolutions down to 1 ms.A set of electronics combines the electron data with F4 wave data to allow on-board calculations of cross-correlations between electron fluxes and wave electric fields. Additionally, a fast signal processor is capable of searching the electron pulse sequence from one or several channeltrons for high-frequency modulations in the electron flux. |
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