Ecliptic coordinate system representation of the Lyman alpha
background observed by Swan on 0000-00-00
The intensity is coded in false colors. The scale is in units of counts
per second. The white dots correspond to ultra-violet emission of hot
stars and are denser along the plane of the the Milky Way. The dark
areas are caused by obstruction of the field of view of the instrument
by the sunshield and the SOHO spacecraft itself. The non-uniformity of
the intensity pattern is due to a combination of interplanetary
Hydrogen atom velocities relative to the Sun and ionization processes
from the Sun.
The SWAN instrument was developed in cooperation between the Service d'Aeronomie du CNRS (Verrieres le Buisson, France) and the Finnish Meterological Institute (Helsinki, Finland) with support from the French and Finnish space agencies.
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