![](https://www.pdfsearch.io/img/d88e2fc5c58e67e9511594e2f6bbe8a4.jpg) Date: 2015-08-20 18:05:42
| | Dramatic
Changes
in
the
Heliospheric
Current
Sheet:
Cycles
21-‐24
J
Todd
Hoeksema
Wilcox
Solar
Observatory
Stanford
University
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