Transient Dimming of the Bright Fe XIV Emission Region in the Solar Corona of the 21 August 2017 Total Solar Eclipse

Abstract

During the 21 August 2017 total solar eclipse the corona was observed through a narrowband filter centered at the Fe XIV green emission line at a cadence of 30 frames/s. A bright region on the east limb was observed to dim during the 2 m 35 s totality. Details of the temporal behavior of this region are reported. The likely association of the dimming with a coronal mass ejection (CME) in progress during the eclipse or the small sunspot group with coronal loops near the east limb is discussed.