Hello world!

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32 Responses to “Hello world!”

  1. Leif Svalgaard Says:

    This is my 1st post

  2. Bob Tisdale Says:

    And your new blog has been bookmarked. Looking forward to it.



  3. Bob Tisdale Says:

    That should have read, And your new blog has been added to my Favorites. It’s early here.

  4. beng Says:

    ‘Bout time! Bookmarked.

  5. Otter Says:

    Thought that was you when I clicked on your name, but, when did you change it, or is that just due to the blog?

    In any case, you are now added. Curious to see what you have to say.

  6. Ric Werme Says:

    main() {
    printf(“Hello Leif!\n”);

  7. garry dauron Says:

    Really enjoyed your Stanford presentation on “Becoming a Scientist” and today’s comment.

    “Leif, for a man who is excellent, when it comes to the narrow range of your expertise, you seem unaware of worlds outside your canyon.
    When people come into my canyon I tell them the facts. And how do you justify to state that my range of expertise is ‘narrow’? as compared to many commenters here who have no expertise”.

    Where do you think your research into the Sun’s magnetic fields is going to lead (read your paper from the late 70’s)?

    Judith Curry’s blog posts over the past couple weeks have been a nice compliment to your approach to science and learning. I hope you have another wonderful 30 years.

    Happy New Year,

  8. Scarface Says:

    Time for a second post!

  9. lancifer666 Says:

    Dr. Svalgaard, I always look forward to your informed and cogent remarks at WUWT. Now I will bookmark this blog also.

    I agree with your opinions about the lack of correlation between solar activity and recent warming. Some people are desparate to find something besides CO2 so they have jumped on the solar bandwagon.

    I am a “luke warmer” and don’t think there is any calamity awaiting us from anthropogenic CO2, but if the temperatures start to agree with the models I would have to reconsider.

    I am a scientist first after all.

    Also I admire your patience with certain posters at WUWT.


  10. George Bingham Says:

    Dear Dr Svalgaard,

    I follow your comments on WUWT with interest and have read many of your research papers, a great number of the earlier of which concern the IMF.

    There being no magnetic monopoles, I understand the IMF to be sum of all the magnetic fields associated with each of the bodies in our solar system, capable of producing the same – the sun being clearly by far and away the largest body.

    Since we know much more of the shape of the IMF from time to time, and the influence which the solar MF has upon it, I wondered whether research has been published considering whether the IMF – given particular patterns of field lines and strength in particular locations within the system at particular times – might be able to influence the geomagnetic field so greatly that the IMF might be able to initiate reversals (or excursions as once known) in the Main Field of this planet.

    This would stand as a tentative alternative to those theories of geomagnetic reversals et al based on internally generated changes in Earth’s core.

    kind regards,

    George Bingham

    • lsvalgaard Says:

      The IMF is 10,000 times weaker than the Earth’s magnetic field at the surface, and a million times weaker than the core field [which is where the surface field comes from]. Even with the occasional [rare] enhancements of the IMF during CMEs the IMF cannot influence the core field. This is apart from the fact that the so-called skin-depth is so shallow that magnetic field changes cannot [and do not] enter the core at all.

      • George Bingham Says:

        Dear Dr. Svalgaard,

        Thank you for that clear response. Is it your view additionally that there can likely be no major impact on (that is to say, not simply a magnetic storm but sufficient impact to initiate a reversal in) the earth’s magnetic field from solar effects alone?

        I am referring to massive CME’s, or changes in the solar wind speed and density arising from some other solar activity.

        with kind regards,

        George Bingham

  11. lsvalgaard Says:

    The Earth’s strong magnetic field and the relatively high conductivity of the mantle [plus the very high conductivity of the core] combine to shield our main magnetic field from solar mischief. So, don’t expect any effect form solar activity on the core field. At the surface there can be inductive effects from rapid changes in the external magnetic field. These effects can be sever: burnout transformers, corrosion of pipelines, see silde 13 of http://www.leif.org/research/On-Becoming-a-Scientist.pdf

    • George Bingham Says:

      Thank you, I appreciate your response. I would still like to have an opportunity to re-read your papers on the IMF in particular.

      In the meantime, am right in thinking that absent the solar wind, the sun facing section of the earth’s field would likely expand until it met with equal force and intensity the sun’s own field – i.e that the enormous discrepancy between the two field strengths at the sun-ward boundary of earth’s field is due principally to the compressing force of that wind?

      Also in the time since you wrote your earlier papers on the IMF, has science determined with any more clarity the existence, if any, and strength of the magnetic fields of the other bodies in our solar system?

      • lsvalgaard Says:

        Most bodies in the solar system have magnetic fields, some [e.g. Jupiter] much stronger than the Earth’s; some [e.g. the Moon] much weaker and disorganized.
        The Earth’s magnetic field is 10,000 times stronger than the the magnetic field in the solar wind, but decreases with the cube of the distance, so out at something like 10 earth radii is so weak that it matches the energy of the solar wind and a ‘stand-off’ is achieved. Outside of that the solar wind is stronger, inside the Earth’s field is stronger.

  12. Scottish Sceptic Says:


    I saw your comment on WUWT on the solar activity. I’m trying to get some support/action on a Solar Physics and Terrestrial Climate conference (solter.org.uk). Are you interested?

    Mike Haseler email: admin (at) solter.org.uk

  13. Sparks Says:

    Good luck with the new blog Leif.

  14. TL Walker Says:

    Just visiting. I enjoyed how you answered questions on here. Good luck with your blog. Tim

  15. Garry Dauron Says:

    Dr. Svalgaard,
    You just posted “After ‘that one’ the temperature peaked several thousand years ago and has been decreasing ever since, apart fro small random fluctuations as we now seeing…”

    Could you explain what this means to you beyond the obvious.

  16. Brett Keane Says:

    Leif, in discussions of SH SSW, polar vortex highs etc., you refer to their rarity. I take that as a signal to investigate if something unusual is happening, or just something previously unnoticed.

    The role of magnetic field strengths, solar wind, AP indices, CME’s and GCR’s seems important. I note plenty of SH polar vortex blockades in recent years. I would value your comments on cause and effect, changes in detection abilities, and if semi-cyclic solar activities are likely to be important here, etc.? Thanks, Brett Keane, New Zealand

  17. rod leman Says:

    Dr. Svalgaard, You are fighting the fight – good to see you on WUMT, exposing the nonsense.

  18. Carla Says:

    Hi Dr. Svalgaard.
    I’m thinking solar cycle 25 in combination with all the new and existing satellites and telescope arrays we have available will be an enlightening time for the Astro physics communities.

    M. Opher (IBEX team member) thinks that the lobes in the solar wind tail, depicted in one of the IBEX mappings, is showing us that the Ol’ Sol has polar jets bent tailward.
    (maybe even compressed by ISM magnetic field. nooo..)

    California keeps getting hotter and dryer? Hot much hotter do the tectonic plates need to get and that water thing. You and Vera should move to Northern Wis. so you can witness first hand the difference in atmospheric air density. Not to mention those pesky GCR. The latest SWARM magnetic field mapping shows a decline in magnetic field strength in the Western hemisphere around this latitude. Might explain why at Kp 4 aurora can be seen as far south as Hartford, WI, these past 3-4 years?. The same mapping shows an increase in the Indian Ocean.. so

    Hey what’s this blog for anyway, stuff?

  19. Carla Says:

    Hello Dr. Svalgaard..
    Most stunning SDO/AIA image posted on spaceweather.com today.


    Huge baseball seam wow. If that’s not enough in the middle of sun, it looks like a huge 3D knob. Stunning SDO image. How long has that seam been like that? What would a more Galactic scale magnetic field look like cutting through the solar system?

  20. Carla Says:

    I should have prefaced the above with..
    And when you study the image, you should do so with respect to solar rotation and solar orbital direction, Then add our spaceship Earth’s point of the view.

    Hmmm Earthly month to a Solar day..

    Seems that seam has been around awhile…

  21. Bound2needhelp Says:

    Thank you for your WUWT comments. I enjoy your responses and as I know nearly nothing about the sun I am enjoying learning

  22. ldd Says:

    Always look forward to your input when there’s a solar thread up at WUWT.

  23. lsvalgaard Says:

    To the Sunspot Community: I have this handy blog [forum] which I’ll open for discussions about reconstructions of the sunspot group record and spot numbers + related issues.
    I’ll moderate the comments to ensure civility and staying on topic.
    Please use your real name when commenting.

    Comments should be short [less than 3 ‘pages’ with less than 3 Figures].

  24. lsvalgaard Says:

    So here is the first topic:

    Hoyt and Schatten [HS] claim that Wolf and Wolfer saw [and reported] the same number of Groups, in spite of the difference in telescope [Wolfer’s (left) having twice the aperture and twice the magnification of Wolf’s (right)]:

    The number of groups reported by Wolf and Wolfer can be found here [from the Mitteilungen]:

    It is then trivial simply to count how many groups each observer saw, say in a year [naturally corrected for the number of days being less than 365]. This is simple, transparent, and does not make any extraneous assumptions. Here is a graph of the result:

    Wolf’s count is shown in red, Wolfer’s in purple, while Wolfer/Wolf is shown by brown dots. The average ratio is 1.64. Multiplying the Wolf counts by that ratio normalizes them to Wolfer’s [blue], with very good agreement [R^2=0.984].

    One must thus conclude that Wolfer saw 64% more groups than Wolf, rather than the equal amount claimed by HS.

  25. lsvalgaard Says:

    Here I show that the Usoskin et al. (2016) group number series agrees well with the Svalgaard & schatten (2016) series since 1865 [where the underlying data is good]:
    And that hence the methodology used by S&S is no worse than that used by UEA.

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