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From: Dan Richter (1:317/3)
To: All
Date: Mon, 05.04.21 13:00
ES Picture of the Day 05 2021
EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes
and phenomena which shape our planet and our lives. EPOD will collect and
archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.

Einstein's Eclipse, Colorized

April 05, 2021

Image Creator: ESO/Landessternwarte Heidelberg-Königstuhl/F. W. Dyson,
A. S. Eddington, & C. Davidson, P. Hora'lek/Institute of Physics in
Opava, M. Druckmüller
Summary Author: Petr Hora'lek

The total solar eclipse shown above was observed on May 29,
1919, from Sobral, Brazil. Using a digital scan of this eclipse from
one copy of a photographic plate, part of the Heidelberg Digitized
Astronomical Plates (HDAP) project funded by the Klaus Tschira
Foundation, it was possible to reconstruct the solar corona and
also structures of the huge prominence of this scientifically
important eclipse that helped confirm Einstein’s General
relativity. In order to so, however, we needed to separate real details
from scratches and dust on the scan and focus on sub-threshold
information hidden in a high dynamic range of the original photograph.
Since the eclipse was photographed on a classical photographic
plate and the scan was saved in high quality, it was possible to apply
basic postprocessing methods, which are nowadays used for digital
photography, and also apply special Noise Adaptive Fuzzy
Equalization software developed by Professor Miloslav Druckmüller.
Despite very inhomogeneous exposure of the plate and non-perfect
removal of artifacts, fine details in the solar corona of the 1919
eclipse have been preserved and revealed.
The most notable feature is the huge prominence located close to
the equatorial area of the Sun -- the largest prominence ever
captured during a total solar eclipse. Also of note are structures
typical of the uneven solar magnetic field. When such structures
became more obvious, by defining the basic colors of known phenomena in
the image (prominence, solar corona), it was then possible to colorize
the final result and thus for the first time show this famous eclipse
in a way never seen before.
* Sobral, Brazil Coordinates: -3.6895, -40.3486

Related EPODs

Einstein's Eclipse, Colorized Archive - Vernal Equinox Sun
Setting Behind Mount Etna Exact Time of Sunrise and Sunset
Total Solar Eclipse of December 14, 2020 Archive - Afternoon
Analemma for Athens

Sun Links

* NASA Solar Dynamics Observatory
* NASA Solar Eclipse Page
* NOAA Solar Calculator
* The Sun-Earth Connection: Heliophysics
* The Sunspot Cycle
* Solar System Exploration: The Sun
* The Sun Now
* This Week’s Sky

Earth Science Picture of the Day is a service of the Universities
Space Research Association.

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