Now that's what you call a filament!

Look at the size of this beauty... to date, my best capture of a filament.

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What is a filament?

Solar filaments are clouds of ionized gas above the solar surface squeezed between magnetic regions of opposite polarity. Being cooler and denser than the plasma underneath and their surroundings, they appear as dark lines when seen on the solar disk. 

  SpaceWeatherLive.com - website