1.[Reading Materials] Solar Physics & Space Physics
For beginners
The Sun A brief introduction to solar physics by Markus J. Aschwanden in Chapter 4, Encyclopedia of the Solar system. The author did an incredible job in summarizing the current view of the Sun.
Oulu Space Physics Textbook http://www.oulu.fi/~spaceweb/textbook/
Solar Wind and Coronal Expansion, (1972), A.J. Hundhausen First 1 or 2 chapters are very useful. Classical derivation of Parker's solar wind solution, Parker spiral, etc.
More sophisticated descriptions
Physics of Plasmas, (2003), Boyd, T., & J. Sanderson One of the best and most popular introductory book on plasma physics.
Solar Magnetohydrodynamics, (1982), E.R. Priest All the things you want to know about Solar MHD. One of a few classical books in Solar Physics.
Radiative Processes in Astrophysics, by G. B. Rybicki and A. P. Lightman A brief and classical book stress application of radiative processes in astrophysics. However, it's very useful to understand basic physics of emission process in the Sun.
Cosmic Magnetic Fields - Their origin and their activity, By Gene Parker The best understanding of magnetic fields in plasma fluids you can find. Unfortunately it is already out of print and not available in bookstore or amazon. USTC library still have some to borrow, don't miss such a good resource.
2.Re: [Reading Materials] Solar Physics & Space Physics
EOS VOLUME 89 NUMBER 39 23 September 2008 Discovering Earth's Radiation Belts: Remembering Explorer 1 and 3 Fifty years later, scientists look back on the pioneering efforts of the Explorer program's developers, the events that led up to the selection of Explorer 1's launch vehicle, and the discovery of the Earth's radiation belts. [PDF] By F. McDonald and J. E. Naugle