Sky at Night Magazine - - SUMMER OBSERVING -

On most days the Sun’s disc is marked by sev­eral dark, wig­gly streaks at hy­dro­ge­nal­pha wave­lengths. Th­ese fea­tures, called fil­a­ments, are sim­ply promi­nences seen in sil­hou­ette. Like promi­nences, fil­a­ments come in many dif­fer­ent shapes and sizes. Some are rel­a­tively dif­fuse while oth­ers are long and nar­row, ap­pear­ing al­most snake-like. Some fil­a­ments can be huge, stretch­ing across a sub­stan­tial por­tion of the so­lar disc.

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