spaceplasma: Solstice solar flare On June 21st at 03:16 UT, the sun itself marked the solstice with an M2-class solar flare from sunspot AR1777. NASA’s Solar Dynamics Observatory photographed the extreme ultraviolet flash and a plume of material flying
spaceplasma: Solstice solar flare On June 21st at 03:16 UT, the sun itself marked the solstice with an M2-class solar flare from sunspot AR1777. NASA’s Solar Dynamics Observatory photographed the extreme ultraviolet flash and a plume of material flying