Images presented on this page were created from digital images taken by Fred Espenak aboard
Galapagos Legend ship in the Pacific Ocean. The observing conditions were much better compared
with observing conditions on the Discovery ship and therefore the
resulting images are of significantly better contrast. The most complicated step in the image processing
was precise images alignment. The ship rocking caused that particular images were rotated mutually of
more than 15°. The phase correlation technique using the Fourier transform enabled to determine rotation
angles with precision better than 0.05° and to preserve the sharpness of the original images.
The time delay of approximately 84 minutes between the images taken from the Discovery ship and the Galapagos
Legend ship enables to study changes in the solar corona.
Note: If any page needs more than 100 KB to
be downloaded, there exists its lower quality version appointed for slow connection.
Miloslav Druckmüller |
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
Page last update: 19.3.2007