Questions for Dr. L Svalgaard ---- II

[sigurdur]

Thank you for the expert opinion in ref to Preminger's work.

[lsvalgaard]

Jan 20, 2013 3:30:19 GMT sigurdur said:

Dr. Svalgaard:
Daniel Baily seemed to think that even tho you had presented your work, but not published it, that it was not valid.

They have now erased all my posts. Must have hit a nerve or something.

The fifty-odd solar physicists participating in the Sunspot Workshops think our work is valid enough that they will put time and effort into extending and confirming it: ssnworkshop.wikia.com/wiki/Home

[sigurdur]

Dr. Svalgaard:
I think your work is extremely valid.

Skeptical Science seems to think that it isn't. They hate the idea that there was not some great grand Solar event in the early 20th Century to explain the early 20th century warming.

And it would seem that they also aren't very keen with actual statistical tools.

I got banned from their actual site using your literature as references, and now the facebook page as well. Their loss to not keep up with the current science, not ours.

Thank you for all your work and sharing it with us. I find it very valuable.

[france]

dr Svalgaard , Jose Abreu Univ Zurich, wrote this paper about planetary work www.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aa/full_html/2012/12/aa19997-12/aa19997-12.html

[lsvalgaard]

Jan 27, 2013 17:56:13 GMT france said:

dr Svalgaard , Jose Abreu Univ Zurich, wrote this paper about planetary work www.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aa/full_html/2012/12/aa19997-12/aa19997-12.html

papers like this surface every few years...
The Abreu paper has been rejected by more prestigious journals, but seems to have found a more friendly home...

[france]

Dr Svalgaard, where can we follow the aa index ?

[lsvalgaard]

Feb 11, 2013 19:33:32 GMT france said:

Dr Svalgaard, where can we follow the aa index ?

www.geomag.bgs.ac.uk/data_service/data/magnetic_indices/aaindex.html

[france]

Feb 11, 2013 20:11:34 GMT lsvalgaard said:

Feb 11, 2013 19:33:32 GMT france said:

Dr Svalgaard, where can we follow the aa index ?

www.geomag.bgs.ac.uk/data_service/data/magnetic_indices/aaindex.html

thanks,

i found one of your paper www.leif.org/research/IHV%20-%20a%20new%20long-term%20geomagnetic%20index.pdf

[timb]

For L&P effect data, do they publish N and S hemisphere observations in addition to totals? Is field strength declining at the same rate and do they have the same average values for sunspots in each hemisphere ant latitude?

(sorry I'm fixated on Joy's Law correlation particularly in light of "Long-Term Measurements of Sunspot Magnetic Tilt Angles" by Li and Ulrich (2012) and this nagging observation that recent high elevation Northern Hemisphere spots seem to have almost no tilt angle while southern spots do. It's not quantitative, just qualitative. It's expected that the average tilt angle declines with butterfly diagrams but only because the numbers tend to favor more equatorial sunspots. It appears that even high latitude northern sunpots have near 0 angles on the magnetograms.

It would be interesting if L&P observed a N/S difference in sunspots.

[lsvalgaard]

Feb 19, 2013 7:26:50 GMT timb said:

For L&P effect data, do they publish N and S hemisphere observations in addition to totals? Is field strength declining at the same rate and do they have the same average values for sunspots in each hemisphere ant latitude?

(sorry I'm fixated on Joy's Law correlation particularly in light of "Long-Term Measurements of Sunspot Magnetic Tilt Angles" by Li and Ulrich (2012) and this nagging observation that recent high elevation Northern Hemisphere spots seem to have almost no tilt angle while southern spots do. It's not quantitative, just qualitative. It's expected that the average tilt angle declines with butterfly diagrams but only because the numbers tend to favor more equatorial sunspots. It appears that even high latitude northern sunpots have near 0 angles on the magnetograms.

It would be interesting if L&P observed a N/S difference in sunspots.

The L&P data is not analyzed separately for hemispheres. The raw data would allow this as the spot positions are known. You can find a discussion of Joy's law separated by hemispheres here arxiv.org/pdf/1209.1642.pdf
They find an asymmetry between the hemispheres in the mean tilt angles. On average, the tilts are greater in the southern than in the northern hemisphere for all latitude zones, and the differences increase with increasing latitude.
What do you think?

[france]

dr Svalgaard, a question : according your graph solar max already begun because you wrote welcome to solar max, I'm not sure for the date

www.leif.org/research/TSI-SORCE-2008-now.png

[lsvalgaard]

Feb 19, 2013 15:00:34 GMT france said:

dr Svalgaard, a question : according your graph solar max already begun because you wrote welcome to solar max, I'm not sure for the date

I'm not sure either. This maximum will be a long drawn-out affair with no well-defined peak.

[sigurdur]

Thank you Dr. Svalgaard.

[france]

indeed it's very long to see the peak, may be in july, thanks dr Svalgaard

[timb]

Feb 19, 2013 14:10:28 GMT lsvalgaard said:

Feb 19, 2013 7:26:50 GMT timb said:

For L&P effect data, do they publish N and S hemisphere observations in addition to totals? Is field strength declining at the same rate and do they have the same average values for sunspots in each hemisphere ant latitude?

(sorry I'm fixated on Joy's Law correlation particularly in light of "Long-Term Measurements of Sunspot Magnetic Tilt Angles" by Li and Ulrich (2012) and this nagging observation that recent high elevation Northern Hemisphere spots seem to have almost no tilt angle while southern spots do. It's not quantitative, just qualitative. It's expected that the average tilt angle declines with butterfly diagrams but only because the numbers tend to favor more equatorial sunspots. It appears that even high latitude northern sunpots have near 0 angles on the magnetograms.

It would be interesting if L&P observed a N/S difference in sunspots.

The L&P data is not analyzed separately for hemispheres. The raw data would allow this as the spot positions are known. You can find a discussion of Joy's law separated by hemispheres here arxiv.org/pdf/1209.1642.pdf
They find an asymmetry between the hemispheres in the mean tilt angles. On average, the tilts are greater in the southern than in the northern hemisphere for all latitude zones, and the differences increase with increasing latitude.
What do you think?

Yes, that was the paper I was reading. On a very little understanding of the physics, I would be inclined to think that magnetic field strength and rotation rate would determine the angle. That's why I was wondering if L&P ever produced separate hemisphere data.

As for "why"?? I could guess and say the radiative interior body that creates the shearing force is not always in the center of the sun and is pulled and distorted along the rotational axis much like a speaker magnet is pushed and pulled. When it reaches a certain height, shear generated flux is at minimum because the rotation is slower and upward momentum is stopped by gravity and reverses. It's also not a solid so it's more like a distortion in the distribution of volume that is cyclic. The volume distortion from an ideal cylinder would create different sunspots in N and S hemisphere including number and angle and field strength. the more complex the distortion, the stranger the effects might be. Just a thought.