To see the images large just click on the image. There is a cross icon top right to then revert to the smaller size. This applies to all the images on this page.
A prominence (and sunspot area) taken at intervals during the day on 23rd June 2021. Images were taken at 8.40, 9.55 and 11.23.
Notice the Newton’s rings in the middle picture. This was before the need to take frequent flats was realised
No EW alignment.
A group of prominences taken early in the day (9.17am) and later at 6.04pm on 14th July 2021. There are numerous small changes. Note the faint prominence bottom right.
The image on the right is better focused and sharpened.
No EW alignment.
A prominence taken on 29th July 2021 at 9.17 and 10.29. The partial collapse of the lower prominence is visible. Using the time between the images and the solar ruler it was possible to calculate that approximately the speed of collapse war about 3km/s. This is surprisingly low and shows that the collapse is not just due to the sun’s gravity. The value of the acceleration due to gravity at the sun’s surface is 274 m/s^2. To reach a speed of 3km/s would therefore about 11s. The time between the images was 4,560s.
EW aligned.
Five images of the sun each a mosaic of four images taken in white light without a Barlow. (EW aligned)
Dates:
- 17 July 2021
- 18 July 2021
- 19 July 2021 at 8.15
- 19 July 2021 at 16.47
- 22 July 2021
The angle of rotation of the sun is at few degrees to the vertical, but it changes day by day by a small but significant amount.
Even during a day there is a significant solar rotation (images 3 and 4). In the last image the sunspots hace rotated to the extreme left edge.
The images are best seen by clicking to enlarge. The sunspot activity is quite small at this time in the 11 year cycle.
