Image

Corona

This image represents several days (better nights) of hard work which I started aboard Discovery ship and I have finished at home. Because of the cirrus cloud, which interfered the eclipse observing, the contrast of the inner corona was extremely low and it took me a lot of time to find a filtering procedure which enabled me to create an image in an acceptable quality.

During the 2005 total solar eclipse the solar activity cycle was about two years before the minimum and the coronal shape had a lot of features typical for minimum. Especially both magnetic poles of the Sun are well recognizable by typical simple structure of powerlines which are nicely visualized by inhomogeneity of plasma in the solar corona.


 
Click on the image or on the following reference to display the higher resolution image version (1.1 MB, PNG format).

ImageEcl2005_cor239_pub.png
Date08. 04. 2005
TimeSecond contact 19:51:19 UT, third contact 19:51:52 UT
Total eclipse duration 33 s
PlaceAboard Discovery ship in South Pacific ocean
CoordinateS 22° 37.19', W 129° 38.67'
ConditionsImages taken through cirrus cloud, altitude of the Sun 58°
OpticsCanon Zoom Lens EF 100-400 mm 1:4.5-5.6 L IS
Set focal length: 400 mm
Image Stabilizer used in mode 1
CameraCanon EOS 1D Mark II digital camera
Exposure1/2000 s to 1/125 s
ProcessingComposition of 22 images processed by means of Corona 3.0 and ACC 6.0 software
Image processing by Miloslav Druckmüller
SoftwareSofo ACC 6.0 with Match II module, Corona 3.0
NoteThe graph above the table shows the average values of the relative number of sunspots in which the red arrow indicates the time of 2005 eclipse. Graph was created according to data from Sunspot Index Data Center, Brussels.
OrientationThe image is presented in the orientation as it was visible on the sky. The image must be rotated 135° clockwise to achieve the standard orientation i.e. North top, East left
Copyright© 2005 Miloslav Druckmüller

 


Miloslav Druckmüller
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
druckmuller@fme.vutbr.cz
Page last update: 19.3.2007