No. 351, “The Cosmic-Ray Shadow and Coronal Magnetism”, by Frederik Tenholt: Measuring the coronal magnetic field in Antarctica.

No. 350, “Kristian Birkeland”, by Hugh Hudson and Lyndsay Fletcher: Space weather a century ago.

See http://sprg.ssl.berkeley.edu/~tohban/wiki/index.php/RHESSI_Science_Nuggets .
We publish these at roughly two-week intervals and welcome contributions,
which should be related, at least loosely, to RHESSI science.