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The Sun is blank again

More signs that we are easing down to solar minimum: After a period of two weeks of sunspots, the Sun has once again gone blank.

It takes the Sun’s about four weeks to rotate and complete one “day”. What has essentially happened is that right now one face of the Sun is blank while the other face has sunspots. For two weeks, from the last week in June to the first week in July, the blank face was turned towards the Earth. Then the face with sunspots rotated into view for two weeks, and now the blank face has rotated back to face us.

Though new sunspots can always form on either face, I expect this blank stretch to last a few days, at least.

Conscious Choice cover

Now available in hardback and paperback as well as ebook!


From the press release: In this ground-breaking new history of early America, historian Robert Zimmerman not only exposes the lie behind The New York Times 1619 Project that falsely claims slavery is central to the history of the United States, he also provides profound lessons about the nature of human societies, lessons important for Americans today as well as for all future settlers on Mars and elsewhere in space.

Conscious Choice: The origins of slavery in America and why it matters today and for our future in outer space, is a riveting page-turning story that documents how slavery slowly became pervasive in the southern British colonies of North America, colonies founded by a people and culture that not only did not allow slavery but in every way were hostile to the practice.  
Conscious Choice does more however. In telling the tragic history of the Virginia colony and the rise of slavery there, Zimmerman lays out the proper path for creating healthy societies in places like the Moon and Mars.


“Zimmerman’s ground-breaking history provides every future generation the basic framework for establishing new societies on other worlds. We would be wise to heed what he says.” —Robert Zubrin, founder of founder of the Mars Society.


All editions available at Amazon, Barnes & Noble, and all book vendors. The ebook can be purchased direct from my ebook publisher, ebookit, in which case you don't support the big tech companies and I get a bigger cut much sooner. Note that the price for the ebook, $3.99, goes up to $5.99 on September 1, 2022.


Autographed printed copies are also available at discount directly from me (hardback $24.95; paperback $14.95). Just email me at zimmerman @ nasw dot org.


  • Garry

    When I go to the link, there’s a story about transitioning to a new sunspot number. Taking the article at face value it seems like an honest effort, but having seen lots and lots of cases of data manipulation, my suspicions are aroused.

    What do you make of it?

  • Garry

    To be clear, I mean the last link in your posting

  • Garry: I am only mildly skeptical. In this case I don’t think there was any significant effort to change the results to achieve a political gain. Nonetheless, it never pays to lose one’s suspicions, especially in any science field even mildly related to climate, as is the monitoring of the Sun’s activity.

    Having said that, I must add that I have found no evidence of misuse here. The data change seems entirely legitimate.

  • Willi

    Bob, excellent explanation of how rotation affects the appearance of spots, THANKS!

  • Localfluff

    Heliophysics should be the top priority in space exploration and astronomy. It is so very important. Just have a look at the sky, every animal and plant knows that the Sun is the most important thing of all. People built the pyramids to honor and oblige the Sun. NASA spends like 3% of its budget to study it. It is exotic physics. 99.9% of the mass of the Solar system is the Sun’s plasma. Its magnetic field and proton wind and extreme gravity, and flares, should be what most science on Earth should be about. Instead it is just taken for granted as a constant. Space exploration is instead about the robots or field geologists picking up rocks from the Moon or from Mars.

    If the Sun sneezes, like dampens or intensifies its radiation for a thousand years, none of that would be possible anyway. The most exceptional instrument has been built to detect black holes. Well, look up a sunny day, there’s the closest thing to a black hole we have around here. Actually not far from it at all, it will one bad day become a white dwarf, which is a very strange kind of object itself. Black holes aren’t that exotic, they just leave spacetime and have no properties at all.

  • Phill O

    The standard way to re calibrate any system is to collect data under both conditions and look for a fudge fact to convert. This would need to be done for a few years with few and lots of sun spots.

  • Edward

    Localfluff wrote: “it will one bad day become a white dwarf”

    Before that, it will become a red giant, larger in diameter than the Earth’s orbit. One bad day indeed!

    “NASA spends like 3% of its budget to study it.”

    I used to work in a solar astrophysics lab, but I never thought how little we spent on learning about this important part of our lives. It isn’t just counting sunspots, it is figuring out the magnetic fluxes at and near the surface, the magnetic field throughout the solar system, the corona, the roiling and convection of the surface, the dynamics below the surface, and other phenomena, observed or deduced.

    “If the Sun sneezes, like dampens or intensifies its radiation for a thousand years”

    This may be why we are living in an interglacial period of the current ice age, or why this period has remained warmer for longer than some previous ones. We often refer to the cold, glacial periods as ice ages, but that is misleading, as the cold periods have been normal for the past few million years. The interglacial periods are fairly brief, relative to the cold periods.

    Another (more favored) school of thought is that the precession of the Earth’s axis (kind of like a top or toy gyroscope) may be a major source of glacial and interglacial periods. Right now, the North Pole points to the star Polaris (coincidentally named, huh?), but that changes with time.

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