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Stability of the interstellar hydrogen inflow longitude from 20 years of SOHO/SWAN observations

Abstract : A recent debate on the decade-long stability of the interstellar He flow vector, and in particular the flow longitude, has prompted us to check for any variability in the interstellar H flow vector as observed by the SWAN instrument on board SOHO. We used a simple model-independent method to determine the interstellar H flow longitude, based on the parallax effects induced on the Lyman-α intensity measured by SWAN following the satellite motion around the Sun. Our results show that the interstellar H flow vector longitude does not vary significantly from an average value of 252.9◦ ± 1.4◦ throughout the 20-year span of the SWAN dataset, further strengthening the arguments for the stability of the interstellar gas flow.
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Dimitra Koutroumpa, Eric Quémerais, Olga Katushkina, Rosine Lallement, Jean-Loup Bertaux, et al.. Stability of the interstellar hydrogen inflow longitude from 20 years of SOHO/SWAN observations. Astronomy and Astrophysics - A&A, EDP Sciences, 2017, 598, A12 (6p.). ⟨10.1051/0004-6361/201629840⟩. ⟨insu-01412775⟩

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