The
Changing Face of the Sun
Imaged
with a Canon 70D and 300mm lens with Baader ND 5.0 solar safety
film.
( Stabalisation off, iso200, Manual mode -spot focusing - , 1/2000th, F/7.1
- histogram max ca 80%. handheld)
The
synodic (apparent) solar rotation period is 27.3 days (13 degrees in 24hrs ).
Lo is the longitude of the centre of the disk (see Carrington).
[ Ephemeris with WinJUPOS
]
The current solar cycle
(cycle 25) started in 2020 after a period of very
low sunspot activity. A cycle is 11 years, but this appears to be on top of
a longer period of about 100 years.
Solar activity is measured by counting the active areas and spots according
to specific safe methods
to give a Relative Sunspot Number (R),
an index of solar activity.
Starting with Rotation Number 2256, Lo is the solar longitude at the time of observation/image. The hyperlinked date below an image is a picture from SpaceWeather.com
2022Apr23
at 1758 BST, Lo=
97 |
2022Apr24 at 0839 BST, Lo = 89 | 2022Apr25 at 0910 BST, Lo = 75 | 2022Apr26 at 0913 BST, Lo=61 |
Disk orientation in April/May |
2022Apr29
at 1720 BST, Lo=18 |
2022Apr30 at 0740 BST, Lo=10 | Rot. 2257, 2022May04 at 1649 BST, Lo=312 | 2022May05 at 0741 BST, Lo=304 |
2022May06 at 0948 at BST, Lo=289 |
2022May07 at 0834 BST, Lo=277 | 2022May08 at 1141 BST, Lo=262 | 2022May09 at 0853 BST, Lo=251 | 2022May10 at 1312 BST, Lo=235 |
Sketch made on May 6th from a solar projection box. |
2022May11 at 1637 BST, Lo=220 | 2022May12 at 0659 BST, Lo=212 | 2022May13 at 0853 BST, Lo=198 | 2022May14 at 1312 BST, Lo=182 |
2022May15 at 0859 BST, Lo=171 |
2022May16 at 1200 BST, Lo=156 |
2022May17 at 0900 BST, Lo=144 | 2022May17 sketch, Lo=144 | 2022May18 at 0930 BST, Lo=131 |
2022May19 at 0946BST, Lo=118 |
2022May20 at 1230 BST, Lo=103 |
2022May21 at 1430 BST Lo=89 | 2022May22 at 1000 BST, Lo=78 | 2022May23 at |
2022May25 at 1717BST, Lo=35 |
2022May26, Lo=25 |
2022May | 2022May | 2022May |
2022May |