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Observations of a groove in the interplanetary Lyman alpha pattern as the signature of enhanced ionisation in the neutral sheetWe report several observations of the Lyman alpha interplanetary emission recorded by a photometer flown in 1976-1977 on board the Soviet spacecraft Prognoz-5 and Prognoz-6. Several scans made in a plane perpendicular to the sun were cutting through the maximum emission region. where the interstellar hydrogen is approaching nearest to the sun (upwind region). On each of these scans is observed a dip in the intensity curve near the ecliptic plane. about 30 deg wide and approximately equals 10% deep. They reveal the presence of a new feature of the interplanetary emission. a 'groove' aligned approximately with the ecliptic plane. This groove is present only near the upwind direction, and is interpreted as the result of enhanced ionisation of interstellar H by charge-exchange with the solar wind in a sheet of approximately 30 deg around the average position of the neutral sheet at this time of solar this Lyman alpha groove is a prime target for future observations with SWAN experiment on SOHO.
Document ID
19960021301
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
Authors
Bertaux, J. L.
(Centre National de la Recherche Scientifique Meudon-Bellevue, France)
Quemerais, E.
(Centre National de la Recherche Scientifique Meudon-Bellevue, France)
Lallement, R.
(Centre National de la Recherche Scientifique Meudon-Bellevue, France)
Summanen, T.
(Finnish Meteorological Inst. Helsinki, Finland)
Kyrola, E.
(Finnish Meteorological Inst. Helsinki, Finland)
Date Acquired
August 17, 2013
Publication Date
June 30, 1995
Subject Category
Solar Physics
Accession Number
96N24697
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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