Oxygen freeze-in temperatures measured with SOHO/CELIAS/CTOF
| Autor: | Peter Bochsler, M. R. Aellig, S. Hefti, H. Grünwaldt |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Atmospheric Science
Soil Science chemistry.chemical_element Solar radius Aquatic Science Oceanography Atmospheric sciences Oxygen Geochemistry and Petrology Observatory Earth and Planetary Sciences (miscellaneous) Astrophysics::Solar and Stellar Astrophysics Earth-Surface Processes Water Science and Technology Physics Ecology Spectrometer Paleontology Forestry Charge (physics) Solar physics Corona Solar wind Geophysics chemistry Space and Planetary Science Physics::Space Physics Atomic physics |
| Zdroj: | Journal of Geophysical Research: Space Physics. 105:10527-10536 |
| ISSN: | 0148-0227 |
| Popis: | We use the charge time-of-flight (CTOF) mass and charge spectrometer of the charge, element, and isotope analysis system (CELIAS) on board the Solar and Heliospheric Observatory (SOHO) to determine the solar wind oxygen freeze-in temperature T76 from the O7+ and O6+ abundance ratios in the period from days 92 to 229 of 1996 (Carrington Rotations 1908 to 1912). The freeze-in temperature is a conserved property of the solar wind because the charge states do not change after a distance of a few solar radii. Therefore it is an ideal in situ diagnostic for remote sensing of the inner solar corona. We determine the mean freeze-in temperature during the selected period to be 1.6 × 106 K. We use it to map coronal regions of different temperatures and to determine the separation between such regions based on our observation of abrupt transitions of the freeze-in temperature. We find a upper limit for the separation in the inner corona of 1000 km. |
| Databáze: | OpenAIRE |
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