Genesis on-board determination of the solar wind flow regime |
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| Authors: | Neugebauer M Steinberg JT Tokar RL Barraclough BL Dors EE Wiens RC Gingerich DE Luckey D Whiteaker DB |
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| Institution: | (1) Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA;(2) Los Alamos National Laboratory, Los Alamos, New Mexico, USA;(3) Denver, Colorado, USA;(4) Raytheon Missile Systems, Tucson, Arizona, USA |
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| Abstract: | Some of the objectives of the Genesis mission require the separate collection of solar wind originating in different types
of solar sources. Measurements of the solar wind protons, alpha particles, and electrons are used on-board the spacecraft
to determine whether the solar-wind source is most likely a coronal hole, interstream flow, or a coronal mass ejection. A
simple fuzzy logic scheme operating on measurements of the proton temperature, the alpha-particle abundance, and the presence
of bidirectional streaming of suprathermal electrons was developed for this purpose. Additional requirements on the algorithm
include the ability to identify the passage of forward shocks, reasonable levels of hysteresis and persistence, and the ability
to modify the algorithm by changes in stored constants rather than changes in the software. After a few minor adjustments,
the algorithm performed well during the initial portion of the mission.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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