Migration of Solar Filaments
Taken by Peter Rosén on May 12, 2024 @
Central Stockholm, Sweden
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Details:
I have been observing the Sun since the early 1970's and I am still be amazed at discovering features when scratching on its surface (!) that I did not know about.
In May and June of 2024 I managed to photograph the Sun in H-alpha for 32 days in a row, that correspond to more than a complete rotation of the Sun at all latitudes.
I mapped these images as Cylindrical Equatorial Maps in Winjupos. This allows to stop the proper rotation of the Sun and gives the possibility to analyse the evolution and movements of its surface features in detail.
By animating frames over a period of 10 days (the passing of a feature from limb to limb on the solar disc) I noticed that some sunspots and most of the filaments seemed to move to the right and slightly upwards.
Was this due to some mapping errors? It seems that no, this is a real longitudinal migration from East to West and latitudinal to the North (see link bellow).
The filaments are in reality prominences as seen against the brighter solar disc and are subject to the magnetic fields that in turn move due the Sun's differential rotation speed.
A link explaning the odd cardinal directions on the Sun: earthsky.org/sun/east-and-west-on-the-sun-reversed/
/*Peter R
Photographer's website:
No URL provided.
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