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| Titel |
Compton-Getting Correction for STEREO SEPT |
| VerfasserIn |
J. Gieseler, B. Heber, R. Mueller-Mellin, A. Klassen, R. Gómez-Herrero, S. Boettcher |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250030146
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| Zusammenfassung |
| The Solar Electron. and Proton Tclescope (SEPT) is one of four instruments of the Solar
Energetic Partlcle (SEP) suite for the IMPACT investigation on board the (two STEREO
(Solar TErrestrial RElations Observatory) spacecraft, launched end of 2006. SEPT consists of
two dual double-ended magnetic/foil particle telescopes which separate and measure
electrons in the energy range from 30 to 400 keV and ions (mainly protons and a-particles)
from 70 keV to 6.5 MeV. SEPT-E is looking in the ecliptic plane and SEPT-NS perpendicular
to this plane. This setup provides four looking directions for each spacecraft: one looking to
the Sun along the nominal Parker spiral 45 degrees west from the spacecraft-Sun line, another
looking along the Parker spiral but in the anti-solar direction, and two additional
apertures looking North and South perpendicular to the ecliptic. Due to the fact that the
velocity of several tens of keV ions is only by a factor of about 10 higher than the
solar wind speed, it is expected that an isotropic pitch angle distribution in the solar
wind frame becomes anisotropic in the spacecraft frame. Based on the work of
Forman (1970) and Ipavich (1974), we developed a method to correct the SEPT ion
data for this so-called Compton-Getting effect. Because SEPT cannot distinguish
between protons and α-particles, this method is also designed to account for helium
contribution. We will show that with this method the SEPT data can be transformed
succesful1y to the solar wind frame and apply the method to selected particle events. |
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