Fe IX, 435.9 nm

This is, up to now, the only existing image of Fe IX 435.9 nm emission in solar corona. This emission line is very weak therefore the image calibration and processing must be very precise in order to separate the emission line from continuum (photospheric light scattered on free electrons).
Click on the following reference to display the same image in the maximum quality (604 KB, PNG format).

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 visible achromat 4/200mm equipped with following narrow band filters:
  On-band filter: Andover, center wavelenght: 436.0 nm, bandwidth 50%: 0.5 nm
  Off-band filter: Andover, center wavelenght: 434.8 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