This list is by no means exhaustive, but it does contain the website addresses I have used myself and I think might be useful to you for finding out further information on solar, aurora and equipment suppliers.
1, SpaceWeather: http://www.spaceweather.com/
2, Solarham: www.solarham.net
3, Big Bear Solar Observatory: http://www.bbso.njit.edu/
4, Zurich Sunspot Classification: http://www.aavso.org/zurich-classification-system-sunspot-groups
5, McIntosh Sunspot Group Classification (Modified Zurich):http://www.petermeadows.com/html/glossary.html
6, Tilting Sun (software): http://www.atoptics.co.uk/tiltsun.htm
7, Peter Meadows (amateur solar observer): http://www.petermeadows.com/indexsolar.html
8, How to make a solar filter (short video – The Sky at Night):http://www.bbc.co.uk/programmes/p014hpkh (be sure to follow the instructions carefully)
9, MrEclipse.com (loads of stuff about all eclipses including solar): http://www.mreclipse.com/MrEclipse.html
10, SPA Aurora Section: http://www.popastro.com/main_spa1/aurora/
11, AuroraWatch UK: http://aurorawatch.lancs.ac.uk/
12, First Light Optics (solar filters): http://www.firstlightoptics.com/solar-filters/astrozap-baader-solar-filter.html
13, Baader Astro Solar Safety Film (First Light Optics): http://www.firstlightoptics.com/solar-filters/baader-astrosolar-safety-film-nd-50.html
14, Telescope House (solar filters):
15, Thousand Oaks (solar filters): http://thousandoaksoptical.com/solar.html
16, Lunt: http://www.lunt-solarsystems.eu/
17, Solarscope: http://www.solarscope.co.uk/products.html
18, Coronado (Meade Instruments): http://www.meade.com/products/coronado.html
“How to Observe the Sun Safely” by Lee Macdonald, 2012. £24.99. Springer
“Observing the Sun” by Eric Strach. Liverpool Astronomical Society, 1992. Pp 10, £1.50 (softback).
‘”The Sun in Hydrogen Alpha” by Eric Strach. Liverpool Astronomical Society, 1992. Pp 11, £1.50 (softback).