The Heliosphere---Blowing in the Interstellar Wind
P. C. Frisch
TL;DR
This paper reviews forty years of measurements of interstellar helium flow into the heliosphere, highlighting a gradual change in flow direction possibly due to astronomical factors.
Contribution
It compiles and analyzes long-term data on interstellar helium flow and discusses potential astronomical causes for observed directional variations.
Findings
Interstellar helium flow direction has shifted by approximately 0.19 degrees per year.
Historical data indicate a gradual change in the interstellar flow entering the heliosphere.
Possible astronomical explanations for flow variations are proposed.
Abstract
Measurements of the velocity of interstellar HeI inside of the heliosphere have been conducted over the past forty years. These historical data suggest that the ecliptic longitude of the direction of the interstellar flow has increased at an average rate of about 0.19 degrees per year over time. Possible astronomical explanations for these short-term variations in the interstellar gas entering the heliosphere are presented.
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