Swan Observations of the Solar Wind Latitude Distribution and its Evolution Since Launch
| Autor: | Bertaux, Jean-Loup, Kyrölä, Erkki, Quémerais, Eric, Lallement, Rosine, Schmidt, Walter, Summanen, Tuula, Costa, Jorge, Mäkinen, Teemu |
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| Přispěvatelé: | Service d'aéronomie (SA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Finnish Meteorological Institute (FMI) |
| Jazyk: | angličtina |
| Rok vydání: | 1999 |
| Předmět: |
Solar Cycle
[SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] Astrophysics::High Energy Astrophysical Phenomena Physics::Space Physics Solar Wind Slow Solar Wind Fast Solar Wind Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Solar Minimum Astrophysics::Galaxy Astrophysics |
| Zdroj: | Space Science Reviews Space Science Reviews, 1999, 87 (1/2), pp.129-132. ⟨10.1023/A:1005178402842⟩ |
| ISSN: | 0038-6308 1572-9672 |
| Popis: | International audience; SWAN is the first space instrument dedicated to the monitoring of the latitude distribution of the solar wind by the Lyman alpha method. The distribution of interstellar H atoms in the solar system is determined by their destruction during ionization charge-exchange with solar wind protons. Maps of sky Ly-α emission have been recorded regularly since launch. The upwind maximum emission region deviates strongly from the pattern that would be expected from a solar wind that is constant with latitude. It is divided in two lobes by a depression aligned with the solar equatorial plane, called the Lyman-alpha groove, due to enhanced ionization along the neutral sheet where the slow and dense solar wind is concentrated. The groove (or the anisotropy) is more pronounced in 1997 than in 1996, but it then decreases between 1997 and 1998. |
| Databáze: | OpenAIRE |
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