Image

Corona

This image shows the coronal shape typical for minimum of the solar activity cycle. The coronal structure is changing during the eleven-year solar cycle significantly. It is spread approximately evenly to all spatial directions near the solar cycle maximum (for example 1990, 1999, 2001 eclipses) but near the solar cycle minimum the coronal intensity is much greater in equatorial plane than in polar regions.

ImageSe1995i_cor1.png
Date24. 10. 1995
TimeSecond contact: 03:02:43 UT, third contact 03:03:33 UT
Total eclipse duration 50s
PlaceIndia (Rajastan), Nim Ka Thana
CoordinateN 27° 44', E 75° 48'
ConditionsVery good
OpticsZeiss AS 15/3000 mm
8/500mm lens
Resolution8.90 arc sec / pixel (image on this Web page)
FilmKodak Ektachrome 100 Plus (5005 EPP) of 24×36mm format for 8/500mm lens
Kodak 1781 slide film of 18×24cm format for Zeiss AS 15/3000mm
ProcessingComposition of 10 images,
8 images taken with 8/500mm lens - exposures 4s ... 1/30s,
2 images taken with Zeiss AS 200/3000mm telescope,
Images were aligned by means of phase correlation technique and then processed using Corona 3.0 software.
Image processing by Miloslav Druckmüller
ScannerNikon Super Coolscan 4000 ED (16x multisample) for 24×36mm images
Canoscan 9900F for 18×24cm images
SoftwarePhaseCorr 3.0, Corona 3.0, Sofo ACC 6.0
NoteThe graph above the table shows the average values of the relative number of sunspots in which the red arrow indicates the time of 1995 eclipse. Graph was created according to data from Sunspot Index Data Center, Brussels.
OrientationThe image must be rotated 30.0° clockwise to achieve the standard orientation i.e. North top, East left
Copyright© 1995 Vojtech Rušin © 2004 Miloslav Druckmüller
 


Miloslav Druckmüller
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
druckmuller@fme.vutbr.cz
Page last update: 25.5.2009