Baily's beads, chromosphere & prominences during the totality (Aug 21, 2017)

Date & Time: Aug 21 2017, times are displayed in image, 1/8000sec. exposed each
Optical: BORG 60ED with a correction lens (f=378mm, F6.3)
Auto-guided with EYEBELL CD-1 portable Equatorial
Digital Camera: Nikon D810A
Location: Salem, Oregon, USA

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(7360×4912)
Device Size...FX format (36×24mm)
Sensitivity...ISO200, White Balance...Daylight

This combined image shows you two moments of just before start and right after end of the totality on Aug 21, 2017. The image can show the "Baily's beads" due to the last and first leakage solar light from the lunar edge, the reddish chromosphere, and the prominences risen up from it. In the totality, remarkable three prominences could be recognized in west solar rim. The positions of Baily's beads are corresponding to deep valleys along the lunar edge. It can be seen that their positions are not diametrically opposite.

Change of the Diamond Ring

Streamline structure of the corona

Copyright(c) 2017 by Naoyuki Kurita, All rights reserved.
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