First Results from the Genesis Autonomous Solar Wind Regime Algorithm

Details First Results from the Genesis Autonomous Solar Wind Regime Algorithm First Results from the Genesis Autonomous Solar Wind Regime Algorithm

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh42c..02s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH42C-02

Mathematics

Logic

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2164 Solar Wind Plasma, 2169 Sources Of The Solar Wind, 2194 Instruments And Techniques, 2199 General Or Miscellaneous

Scientific paper

Launched on August 8, 2001, the NASA Genesis mission will collect samples of the solar wind in various materials for approximately two years, and return those samples to Earth for analysis. A primary science goal of Genesis is the determination of the elemental and isotopic composition of the solar atmosphere from the solar wind material returned. Because the solar wind itself is known to exhibit compositional variations across different types of solar wind flows, Genesis will expose different collectors to solar wind originating from three flow types: coronal hole (CH), coronal mass ejection (CME) and interstream (IS) flows. Flow types are identified using in situ measurements of solar wind ions and electrons from electrostatic analyzers carried by Genesis. The flow regime selection algorithm and subsequent array deployment on Genesis act autonomously, taking into account the proton speed, proton temperature, alpha particle abundance, and the presence of counter-streaming suprathermal electrons as determined onboard. Autonomous determination of counter-streaming electrons is novel, as is the simultaneous utilization of electron information and ion moments in logic that autonomously controls the science payload. We will report on the first four months of algorithm performance, comparing the onboard results to an assessment of regime based on post analysis of the in situ solar wind measurements. At the time of this writing, the regime algorithm has been active for eleven days, choosing regime IS for the first ten days, then transitioning to CH. In addition two interplanetary shocks have been correctly identified.

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