The GENESIS Solar-Wind Sample: Summary of In-Situ Spacecraft Measurements During the Sample Collection Period

Details The GENESIS Solar-Wind Sample: Summary of In-Situ Spacecraft Measurements During the Sample Collection Period The GENESIS Solar-Wind Sample: Summary of In-Situ Spacecraft Measurements During the Sample Collection Period

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh12a..02r&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH12A-02

Other

7594 Instruments And Techniques, 5455 Origin And Evolution, 2164 Solar Wind Plasma, 2169 Sources Of The Solar Wind

Scientific paper

The GENESIS mission returned samples of solar wind to earth on September 8. These samples were collected between 30-Nov-2001 and 01-Apr-2004 at the L1 point on ultrapure substrates that are being analyzed using various laboratory techniques. The primary purpose of the GENESIS mission is to determine to unprecedented accuracy (e.g., ±1%-0.1%, 2σ ) the isotopic composition of the solar wind, and by extension, of the Sun, particularly for oxygen, nitrogen, carbon, and the noble gases. In addition to a continuously-collected sample, separate samples of the different regimes-coronal hole (CH), interstream (IS), and coronal mass ejection (CME)-were collected to help deconvolve any fine-scale isotopic fractionation associated with solar-wind ionization and acceleration. The four different samples (3 regimes plus one cumulative sample) are long-term averages over varying solar-wind conditions, and need to be understood within the context of other measurements besides those that can be made on the substrates themselves. These include charge state, v, T, density, and magnetic field data. Additionally, comparisons of in-situ elemental composition measurements with the measurements made on GENESIS samples will be useful in validating the different measurement techniques. For these reasons, we are compiling a database of conditions as measured by in-situ spacecraft instruments stationed at L1 over the time period of the GENESIS sample collection. Comparison with ACE/SWICS elemental and charge-state abundances confirmed early in the GENESIS mission that the GENESIS regime-selection algorithm was successfully isolating the CME material, protecting the CH and IS samples from CME contamination. The data also demonstrate the discrimination between IS and CH flow types based mostly on solar-wind speed, but allowing compensation for evolution effects due to the transit to 1 AU.

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