Mass Transport by Heliospheric Energetic Neutral Atoms

Physics

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2124 Heliopause And Solar Wind Termination, 2144 Interstellar Gas, 2151 Neutral Particles, 2152 Pickup Ions, 2164 Solar Wind Plasma

Scientific paper

Energetic neutral atoms (ENAs) are recognized as a powerful tool for remote probing of hot space plasmas in distant regions. The plasmas at the heliospheric boundary where the expanding solar wind meets the surrounding local interstellar medium are believed to produce ENAs. The heliospheric ENAs originating in the heliospheric sheath between the termination shock and the heliopause and reaching the inner heliosphere also provide an important and heretofore-unaccounted source of atomic hydrogen in the sun's vicinity. We show that these ENAs are a major contributor to the density of interplanetary hydrogen at heliocentric distances < 1 AU and could dominate in the downwind (interstellar wind) region under typical solar and interstellar conditions. Mass transport in the heliosphere by ENAs may become especially important for determining the origin of the inner source of neutral particles in the sun's vicinity and for characterization of the three-dimensional solar wind flow by imaging in extreme ultraviolet.

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