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Observations of a sky Lyman α groove related to enhanced solar wind mass flux in the neutral sheet

Bertaux, Jean-Loup; Lallement, Rosine; Quémerais, Eric

We report several observations of the Lα interplanetary emission recorded by a photometer flown in 1977 on board the soviet spacecraft Prognoz-5. The Prognoz scans sampled emission in a plane perpendicular to the sun-spacecraft line and also traversed the Lα maximum emission region (MER), a region centered a few AU from the Sun on the upstream int…