The solar wind shock termination |
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| Institution: | 1. Aix Marseille Univ, CNRS, LAM, Laboratoire d’Astrophysique de Marseille, Marseille, France;2. GEOPS, Univ. Paris-Sud, CNRS, Universit Paris-Saclay, Rue du Belvdre, Bt. 504-509, 91405 Orsay, France;3. Physikalisches Institut, Sidlerstr. 5, University of Bern, CH-3012 Bern, Switzerland;4. Institut de Mécanique Céleste et de Calcul des Ephémérides, UMR8028, 77 Avenue Denfert Rochereau, 75014 Paris, France;5. Planetary Science Institute, Tucson (AZ), USA;6. Jet Propulsion Laboratory, M/S 183-301, 4800 Oak Grove Drive, Pasadena, USA;7. Southwest Research Institute, 1050 Walnut St., Boulder, CO 80302, USA;8. Max-Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany;9. Department of Physics and Astronomy, Padova University, Vicolo dell’Osservatorio 3, 35122, Padova, Italy;10. Centro de Astrobiologia (INTA-CSIC), 28691 Villanueva de la Canada, Madrid, Spain;11. International Space Science Institute, Hallerstrasse 6, CH-3012 Bern, Switzerland;12. Scientific Support Office, European Space Agency, 2201, Noordwijk, The Netherlands;13. PAS Space Research Center, Bartycka 18A, PL-00716 Warszawa, Poland;14. Institute for Geophysics and Extraterrestrial Physics, TU Braunschweig, 38106, Germany;15. Department of Astronomy, University of Maryland, College Park, MD, 20742-2421, USA;p. LESIA, Obs. de Paris, CNRS, Univ Paris 06, Univ. Paris-Diderot, 5 place J. Janssen, 92195 Meudon, France;q. LATMOS, CNRS/UVSQ/IPSL, 11 boulevard d’Alembert, 78280, Guyancourt, France;r. University of Padova, CISAS, via Venezia 15, 35100 Padova, Italy;s. Department of Mech. Engineering University of Padova, via Venezia 1, 35131 Padova, Italy;t. CNR-IFN UOS Padova LUXOR, via Trasea 7, 35131 Padova, Italy;u. UNITN, Universit di Trento, via Mesiano, 77, 38100 Trento, Italy;v. INAF - Osservatorio Astronomico, Via Tiepolo 11, 34143, Trieste, Italy;w. Instituto de Astrofisica de Andalucía (CSIC), Glorieta de la Astronomía s/n, 18008 Granada, Spain;x. Institute of Planetary Research, DLR, Rutherfordstrasse 2, 12489, Berlin, Germany;y. Institute for Space Science, Nat. Central Univ., 300 Chung Da Rd., 32054, Chung-Li, Taiwan;z. Operations Department, European Space Astronomy Centre/ESA, P.O. Box 78, 28691 Villanueva de la Canada, Madrid, Spain;11. INAF, Osservatorio Astronomico di Padova, 35122 Padova, Italy;12. Centro di Ateneo di Studi ed Attivitá Spaziali “Giuseppe Colombo” (CISAS), University of Padova, 35131 Padova, Italy;13. Institut für Datentechnik und Kommunikationsnetze der TU Braunschweig, Hans-Sommer-Str. 66, 38106 Braunschweig, Germany;14. University of Padova, Department of Information Engineering, Via Gradenigo 6/B, 35131 Padova, Italy;15. Instituto Nacional de Tecnica Aeroespacial, Carretera de Ajalvir, p.k. 4, 28850 Torrejon de Ardoz (Madrid), Spain |
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| Abstract: | We analyse the possibility that the shock termination of the solar wind should occur at a heliocentric distance of 50 a.u. It is concluded that this is possible if the density of the interstellar medium near the Sun is of the order of 0.5 cm−3, or the pressure of low energy cosmic rays (less than about 300 MeV/nucleon) is of the order of 6×10−12 dyn cm−2, or the interstellar magnetic field strength is of the order of 8 microgauss, or some suitable combination of these. Such conditions would not normally be expected to prevail in the interstellar medium in the neighbourhood of the Sun. However, the possibility that a supernova explosion occurred nearby some 105–106 years ago must be taken seriously and in such circumstances the required conditions may be relatively easily achieved. |
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