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Solar Analemma. This outstanding image from Alexandra Hart taken over a period of 4 years charts the midday position of the sun in the sky throughout the year. The north–south component of the analemma results from the change in the Sun's declination due to the tilt of Earth's axis of rotation. The east–west component results from the nonuniform rate of change of the Sun's right ascension, governed by combined effects of Earth's axial tilt and orbital eccentricity.

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Moving forward from solar cycle 24 to 25

More Cycle 25 Activity - 14th January

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More Cycle 25 Activity - 14th January

Post by marktownley » Tue Jan 14, 2020 8:19 pm

Check out this animation, showing activity from the SDO AIA304 channel. Look at the 10 o'clock position how a small emerging flux region develops. Given the latitude my money is on it being cycle 25...
304.gif
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Re: More Cycle 25 Activity - 14th January

Post by MAURITS » Tue Jan 14, 2020 9:20 pm

Thanks for sharing Mark.
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Re: More Cycle 25 Activity - 14th January

Post by rsfoto » Tue Jan 14, 2020 9:54 pm

Hi Mark,

We all hope so. That is maybe 20° ?

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Re: More Cycle 25 Activity - 14th January

Post by MalVeauX » Tue Jan 14, 2020 10:21 pm

Hrm, current magnetogram shows polarity from what I can see of cycle 24 unless I'm mistaken?

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Re: More Cycle 25 Activity - 14th January

Post by marktownley » Tue Jan 14, 2020 10:52 pm

Quite possibly guys.
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Re: More Cycle 25 Activity - 14th January

Post by rsfoto » Wed Jan 15, 2020 12:41 am

marktownley wrote:
Tue Jan 14, 2020 10:52 pm
Quite possibly guys.
Hi,

Looks like cycle 25 as it is negative / positive in the northern hemisphere, because the old spot is negative Positive but it is in the southern hemisphere. OK, I do not know how exact the distribution is when being very near the Equator. :?

https://sdo.gsfc.nasa.gov/assets/img/la ... 8_HMIB.jpg
Last edited by rsfoto on Wed Jan 15, 2020 6:05 pm, edited 1 time in total.
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Re: More Cycle 25 Activity - 14th January

Post by ffellah » Wed Jan 15, 2020 1:04 am

Thank you Mark for the heads up !

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Re: More Cycle 25 Activity - 14th January

Post by Montana » Wed Jan 15, 2020 10:15 am

I would be surprised if it were cycle 24 that far north. We are now getting weekly activity, good times are coming :hamster:
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Re: More Cycle 25 Activity - 14th January

Post by krakatoa1883 » Wed Jan 15, 2020 10:51 am

Thanks, Mark. Another one is just emerging from the limb at an even higher latitude.
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Re: More Cycle 25 Activity - 14th January

Post by salvo lauricella » Wed Jan 15, 2020 12:59 pm

Thanks for sharing this.

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