(region just beyond the heliosphere)
The heliosheath is the region just beyond the heliosphere
where the solar wind has slowed to subsonic speed and is interacting
with the interstellar medium. It is about 80 to 100 AU at its closest.
The Voyager spacecraft have reached it and passed it,
reaching and passing the heliopause, which could be
considered the outer edge of the heliosheath.
(solar system,heliosphere,solar wind)
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anomalous cosmic rays (ACR)