Fe X, forbidden line 637.4 nm

Fe X is one of two prominent forbidden lines of Fe ions in the visible part of coronal spectrum. The image shows all solar corona which was progressively visible from our observing place. That is why the black part of the image, which is the area without any information about solar corona, is not round. It is an intersection of two circles representing the position of the Moon in the beginning and at the end of the total solar eclipse.

Date11. 07. 2010
Time2nd contact 18:45:36 UT, 3rd contact 18:50:05 UT
Total eclipse duration 4 m 29 s
PlaceTatakoto Atoll, French Polynesia
CoordinateS 17° 20' 39.3'',   W 138° 27' 3.1'',  Alt. 6 m
ConditionsPartially clear, partially thin clouds
Optics2× Thorlabs near IR achromat 4/200mm equipped with following narrow band filters:
  On-band filter: Andover, center wavelenght: 637.5 nm, bandwidth 50%: 0.5 nm
  Off-band filter: Andover, center wavelenght: 636.4 nm, bandwidth 50%: 0.5 nm
Camera2× Atik 314L+ (chip Sony ICX285AL)
ProcessingImage processing by Miloslav Druckmüller
SoftwarePhaseCorr 6.0, LDIC 5.0, Corona 4.1, Sofo ACC 6.1
NoteSee this ApJ paper for more details.
OrientationSee this image. The white circle represents the position of photosphere.
Copyright© 2010 Shadia Habbal, Huw Morgan, Judd Johnson, Martina Arndt, Adrian Daw
© 2011 Miloslav Druckmüller

Miloslav Druckmüller
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
Page last update: 6.8.2014