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On the Stability of the Interstellar Wind through the Solar System

Abstract : As a follow-up of a recent study [1], we challenge the claim that the flow of interstellar helium through the solar system has changed substantially over the last decades. We argue that only the IBEX-Lo 2009/2010 measurements are discrepant with older consensus values. Then we show that the probability of the claimed variations of longitude and velocity are highly unlikely (≈1%), in view of the absence of change in latitude and absence of change in the (V, λ∞) relation, while random values would be expected. Finally, we report other independent studies showing the stability of Helium flow and the Hydrogen flow over the years 1996-2012, consistent with the 70's earlier determinations of the interstellar flow.
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Jean-Loup Bertaux, Rosine Lallement. On the Stability of the Interstellar Wind through the Solar System. Journal of Physics: Conference Series, IOP Publishing, 2015, 13th Annual International Astrophysics Conference: Voyager, IBEX, and the Interstellar Medium 10 March 2014, Myrtle Beach, SC, USA, 577, pp.012004. ⟨10.1088/1742-6596/577/1/012004⟩. ⟨hal-01105226⟩

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