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    ESA > Space in Images > 1998 > 01 > All-sky Lyman-alpha Map

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    All-sky Lyman-alpha Map

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    • Title All-sky Lyman-alpha Map
    • Released 01/01/1998 12:00 am
    • Copyright NASA/ESA
    • Description

      Whole -sky map (ecliptic coordinates) of Lyman-alpha emission observed by Soho's SWAN instrument. Two areas were not covered for safety reasons, around the Sun (at left) and around the anti-solar direction (at right). The colour codes the intensity, in counts per second per pixel (one square degree). A number of UV hot stars can be identified, tracing the galactic plane. The rest of the ubiquitous emission is due to solar UV Lyman-alpha photons, backscattered by hydrogen atoms in the solar system. These H atoms came from interstellar space, and are approaching the Sun down to about 2 AU, in the direction of the incoming flow. A maximum of Lyman-alpha intensity surrounds this upwind direction. In the opposite direction, the emission is weaker by a factor of 3.5, because most atoms have been destroyed by charge-exchange with solar wind protons, creating a cavity void of hydrogen atoms in the downwind direction. A detailed comparison of such Lyman-alpha maps will allow determination of the solar wind mass flux at all ecliptic latitudes. [Image Date: 19-11-96] [96.11.003-002]

    • Id 192811

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    • Activity Photo Archive (ESA Publications)
    • Keywords Historic Photo Archive, Soho

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