The Variation of Helium Across a Two Solar Cycles
Abstract
We study the relationship between solar wind helium abundance AHe and sunspot number over a full 22-year solar cycle. This is the first full cycle measured with the Wind showing both flips in polarity. Observations from the Wind spacecraft Faraday cups demonstrate a phase offset between AHe and SSN. The study also updates previous results from 2007 and 2012 that demonstrated the strong correlation between AHe and SSN, clearly demonstrating that the sun is entering solar minimum 25.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMSH43B3701A
- Keywords:
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- 2169 Solar wind sources;
- INTERPLANETARY PHYSICSDE: 7509 Corona;
- SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMYDE: 7845 Particle acceleration;
- SPACE PLASMA PHYSICSDE: 7894 Instruments and techniques;
- SPACE PLASMA PHYSICS