No. 148, Slow Magnetoacoustic Waves in Two-Ribbon Flares, by V. Nakariakov and I. Zimovets. Wave dynamics explains arcade development.
http://sprg.ssl.berkeley.edu/~tohban/wiki/index.php/Slow_Magnetoacoustic_Wav...
Older Nuggets are available at http://sprg.ssl.berkeley.edu/~tohban/wiki/index.php/RHESSI_Science_Nuggets (the new series), and at http://sprg.ssl.berkeley.edu/~tohban/nuggets/ (the original series).
We publish these at roughly two-week intervals and welcome contributions, which should be at least loosely related to RHESSI science.