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The Heliosphere in the Local Interstellar Medium
Recent observations from the Voyager spacecraft have suggested that the spectrum of the anomalous cosmic ray component is relatively steep at the termination shock, which is believed to be responsible for accelerating these particles. This conclusion argues that the teimination shock must be weak, which in turn requires that the upstream Mach number in the solar wind must be quite low, ~2.4. It is pointed out that such conditions are unlikely to prevail at all locations along the shock front.doi:10.1007/978-94-009-1782-8_14 fatcat:hne5n6asozafvp6cpcyvhuxn3q