Though there are only a few tiny sunspots on view today (almost impossible to pick out in this image) the quiet sun is a busy place in a narrow band of the red spectrum where hydrogen plasma activity can be seen.
The solar disk is captured with a 0.5 Angstrom bandpass... the prominences using 0.7A. Here is a composite image showing how narrowing the bandpass affects contrast. Here is an image from the same day in inverted light.
May 31, 2013/ captured with Lunt LS152 solar telescope, courtesy Dennis Zywiczynski, Coronado Solarmax90 and PGR Grasshopper Express 6 megapixel camera
© Alan Friedman | all rights reserved