<p>The barycenter of the Solar System is the effect which should be considered physically. Although dominated by Jupiter other planets have substantial effect too, moving the Sun, with 99+% of all mass in the Solar System, around by entire Solar radii (700,000 km). <a href="http://homepages.wmich.edu/~korista/solarsystem_barycenter.pdf" rel="nofollow noreferrer">Illustrated here</a></p>

<p>The diagram below I happened to stumble upon <a href="https://tallbloke.wordpress.com/2011/01/14/gerry-pease-barycentric-orbital-periods/" rel="nofollow noreferrer">here</a>. It shows the distance of the barycenter of the Solar System from the center of the Sun over time, with years on the circle. For some reason it spans from year 1773 to 1851. The peaks in the clover curve are regularly separated by about a sunspot cycle, or rather a bit longer. I suppose that the pattern of 2 big and 1 small sequential bulbs there reflects that Jupiter's and Saturn's orbital periods are about 3:1.</p>

<p>As StephenG says, that is just a numerological hint or coincidence, not an explanation. Another example is that the rotational period of the Sun is roughly similar to the orbital period of the Moon around Earth, with a similar error, but no one imagines any connection there.</p>

<p>It is however known that hot Jupiters, giant planets near stars, cause large starspots which rotate along with the planet's orbit. And the relatively tiny moons of Jupiter cause visible spots in the planetary aurora. Actually, the Sun causes an auroral "Jupiter spot"! So there are physics around which under certain conditions create sunspot-like effects.</p>

<p><a href="https://i.sstatic.net/jtKoA.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/jtKoA.png" alt="enter image description here"></a></p>

<p>Diagram: <em>Barycenter distance from the Sun's center over time</em></p>

<p><a href="https://i.sstatic.net/vzWHt.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/vzWHt.png" alt="enter image description here"></a></p>

<p>Hubble image:<em>The aurora on a pole of Jupiter in UV</em></p>

CC BY-SA 4.0
2018-05-16T06:32:01.483Z
It's butterflies all the way down!
Mauro Lacy
CC BY-SA 4.0
2019-08-22T04:24:22.010Z
So are you saying that the solar cycle is related to *all* the planets' orbits but since Jupiter is the largest, it dominates the cycle causing the mean to be closest to its orbital period than the other planets which merely perturb that cycle?
Michael
CC BY-SA 3.0
2016-01-13T13:17:10.003Z
2016-01-13T13:17:10.003Z
LocalFluff
<p>I think for people who want to believe the Jupiter link to solar cycles it will be impossible to disprove.  They'll cling to it forever.</p>

<p>I think in a practical sense the "link" is little more than numerology.  The force Jupiter can exert on the Sun's atmosphere and internal structure is a minute fraction of the magnetic forces at work generated by the Sun itself.</p>

<p>A simple model helps.  Place two magnets a foot apart.  Now place a magnet a thousand feet away from both.  The effect of the distant magnet is one millionth that of the two close together.  That gives you a feel for the relationship between magnetic forces within the Sun's atmosphere and Jupiter's distant influence.  And gravity is an even weaker force.</p>

<p>As I understand it the current daring of models is the Double Dynamo, but certainly the dynamo type models ( all relating to electromagnetic fields generated by the Sun ) are the main contenders.</p>

<p>With people who propose the Jupiter link ( often extended to include Saturn ), there is a tendency to do a lot of algebra to find ways to relate various periods without actually justifying the supposed link on the basis of forces at work ( i.e. doing a simulation or a model based on real physics ).  This is why I call it numerology.</p>

<p>The dynamo models actually are based on real physics and make predictions, both past and future, which can be tested.  This also means the details of these theories can be refined in a proper scientific manner to tease out the truth.</p>

CC BY-SA 4.0
2019-08-22T04:54:58.927Z
Why would the solar cycle have to be driven by magnetic interaction from Jupiter? Couldn't the movement of the barycenter affect how the magnetic fields got twisted around?
Michael
CC BY-SA 3.0
2016-01-12T10:21:06.653Z
2016-01-12T10:21:06.653Z
StephenG - Help Ukraine
<p>Jupiter's <a href="https://en.wikipedia.org/wiki/Jupiter" rel="nofollow noreferrer">orbital period is 11.862 years.</a>The amount of variation will be miniscule.</p>

<p>The solar cycle, while the average cycle time is 11 years, it can vary from 9 to 14 years. From <a href="https://en.wikipedia.org/wiki/Solar_cycle" rel="nofollow noreferrer">the wikipedia article</a>:</p>

<blockquote>
  <p>Since observations began cycles as short as 9 years and as long as 14 years have been observed, and in the double cycle of 1784–1799 one of the two component cycles had to be less than 8 years in length. Significant amplitude variations also occur.</p>
</blockquote>

CC BY-SA 4.0
2019-03-04T23:41:37.507Z
2019-03-04T23:41:37.507Z
Ingolifs
<p>Proportionate to the tidal forces that the moon exerts on the earth, the combined gravity from Jupiter (and other planets when in alignment) seem to be enough to perturb the sun's plasma.</p>
<p><a href="https://www.iflscience.com/venus-earth-and-jupiters-tidal-forces-dictate-the-solar-cycle-suggests-new-study-52600" rel="nofollow noreferrer">https://www.iflscience.com/venus-earth-and-jupiters-tidal-forces-dictate-the-solar-cycle-suggests-new-study-52600</a></p>
<blockquote>
<p>&quot;Researchers from the Helmholtz-Zentrum Dresden-Rossendorf, a German Institute, have found evidence that the peculiarity of the regular solar cycle is to be found not within the Sun, but in its planets. Venus, Earth, and Jupiter have a tidal pull on our star that affects the hot plasma on its surface, much like the gravitational pull of the Moon affects tides on Earth. The team considered their regular alignment, every 11.07 years, to be the one keeping the tempo for the solar cycle. The model is published in the <a href="https://link.springer.com/article/10.1007/s11207-019-1447-1" rel="nofollow noreferrer">journal Solar Physics</a>.&quot;</p>
</blockquote>

CC BY-SA 4.0
2022-08-09T21:23:36.457Z
2022-08-10T07:27:02.737Z
2022-08-10T07:27:02.737Z
Aaron Waller
<p>As another answer says, there <em>is</em> a tendency to do a lot of algebra involving planets' periods. Another approach however is examining the timing of actual solar events. In <a href="https://arxiv.org/abs/1702.00641" rel="nofollow noreferrer">this</a> case, solar flares and their time distribution is related to the relative motion of Jupiter and Saturn, providing predictions. </p>

CC BY-SA 3.0
2017-04-25T17:01:17.257Z
2017-04-25T17:01:17.257Z
Helen
<p>Are we still debating the relationship between Jupiter and solar cycle? If not, what is the common or mainstream opinion about this topic? Or in other words, have we disproved the solar cycle is related to the "year" of Jupiter?</p>

CC BY-SA 3.0
2017-04-25T22:53:12.373Z
If it were connected, it would have to have a lot of slop in it.  The cycle is not anywhere near precisely pegged to Jupiter's orbit.  Another point is that the cycle is actually a 22-year cycle, with polarity flipping from one 11-year cycle to the next.
Brian Tung
CC BY-SA 4.0
2019-04-28T16:44:02.887Z
Most of us are.
uhoh
CC BY-SA 4.0
2022-08-09T23:18:18.683Z
I have a few Sun-Barycentre distance graphs here: https://astronomy.stackexchange.com/a/44903/16685
PM 2Ring
<the-sun><jupiter>
Are we sure solar cycle is not related to the orbit of Jupiter?
Gstestso
# Are we sure solar cycle is not related to the orbit of Jupiter?

(Asked by: username_0 on 2016-01-12)

Are we still debating the relationship between Jupiter and solar cycle? If not, what is the common or mainstream opinion about this topic? Or in other words, have we disproved the solar cycle is related to the "year" of Jupiter?

**Tags:** the-sun, jupiter

> **Comments:**
> **username_1**: If it were connected, it would have to have a lot of slop in it.  The cycle is not anywhere near precisely pegged to Jupiter's orbit.  Another point is that the cycle is actually a 22-year cycle, with polarity flipping from one 11-year cycle to the next.  
> **username_2**: Most of us are.  
> **username_3**: I have a few Sun-Barycentre distance graphs here: https://astronomy.stackexchange.com/a/44903/16685  

---

## 5 answers

### Answer by username_4 on 2016-01-13. Score: 4 | Accepted answer

The barycenter of the Solar System is the effect which should be considered physically. Although dominated by Jupiter other planets have substantial effect too, moving the Sun, with 99+% of all mass in the Solar System, around by entire Solar radii (700,000 km). [Illustrated here](http://homepages.wmich.edu/~korista/solarsystem_barycenter.pdf)

The diagram below I happened to stumble upon [here](https://tallbloke.wordpress.com/2011/01/14/gerry-pease-barycentric-orbital-periods/). It shows the distance of the barycenter of the Solar System from the center of the Sun over time, with years on the circle. For some reason it spans from year 1773 to 1851. The peaks in the clover curve are regularly separated by about a sunspot cycle, or rather a bit longer. I suppose that the pattern of 2 big and 1 small sequential bulbs there reflects that Jupiter's and Saturn's orbital periods are about 3:1.

As username_7 says, that is just a numerological hint or coincidence, not an explanation. Another example is that the rotational period of the Sun is roughly similar to the orbital period of the Moon around Earth, with a similar error, but no one imagines any connection there.

It is however known that hot Jupiters, giant planets near stars, cause large starspots which rotate along with the planet's orbit. And the relatively tiny moons of Jupiter cause visible spots in the planetary aurora. Actually, the Sun causes an auroral "Jupiter spot"! So there are physics around which under certain conditions create sunspot-like effects.

[![enter image description here](https://i.sstatic.net/jtKoA.png)](https://i.sstatic.net/jtKoA.png)

Diagram: *Barycenter distance from the Sun's center over time*

[![enter image description here](https://i.sstatic.net/vzWHt.png)](https://i.sstatic.net/vzWHt.png)

Hubble image:*The aurora on a pole of Jupiter in UV*

> **Comments:**
> **username_5**: It's butterflies all the way down!  
> **username_6**: So are you saying that the solar cycle is related to *all* the planets' orbits but since Jupiter is the largest, it dominates the cycle causing the mean to be closest to its orbital period than the other planets which merely perturb that cycle?  

---

### Answer by username_7 on 2016-01-12. Score: 8

I think for people who want to believe the Jupiter link to solar cycles it will be impossible to disprove. They'll cling to it forever.

I think in a practical sense the "link" is little more than numerology. The force Jupiter can exert on the Sun's atmosphere and internal structure is a minute fraction of the magnetic forces at work generated by the Sun itself.

A simple model helps. Place two magnets a foot apart. Now place a magnet a thousand feet away from both. The effect of the distant magnet is one millionth that of the two close together. That gives you a feel for the relationship between magnetic forces within the Sun's atmosphere and Jupiter's distant influence. And gravity is an even weaker force.

As I understand it the current daring of models is the Double Dynamo, but certainly the dynamo type models ( all relating to electromagnetic fields generated by the Sun ) are the main contenders.

With people who propose the Jupiter link ( often extended to include Saturn ), there is a tendency to do a lot of algebra to find ways to relate various periods without actually justifying the supposed link on the basis of forces at work ( i.e. doing a simulation or a model based on real physics ). This is why I call it numerology.

The dynamo models actually are based on real physics and make predictions, both past and future, which can be tested. This also means the details of these theories can be refined in a proper scientific manner to tease out the truth.

> **Comments:**
> **username_6**: Why would the solar cycle have to be driven by magnetic interaction from Jupiter? Couldn't the movement of the barycenter affect how the magnetic fields got twisted around?  

---

### Answer by username_8 on 2019-03-04. Score: 4

Jupiter's [orbital period is 11.862 years.](https://en.wikipedia.org/wiki/Jupiter)The amount of variation will be miniscule.

The solar cycle, while the average cycle time is 11 years, it can vary from 9 to 14 years. From [the wikipedia article](https://en.wikipedia.org/wiki/Solar_cycle):

> Since observations began cycles as short as 9 years and as long as 14 years have been observed, and in the double cycle of 1784–1799 one of the two component cycles had to be less than 8 years in length. Significant amplitude variations also occur.


---

### Answer by username_9 on 2022-08-09. Score: 3

Proportionate to the tidal forces that the moon exerts on the earth, the combined gravity from Jupiter (and other planets when in alignment) seem to be enough to perturb the sun's plasma.

<https://www.iflscience.com/venus-earth-and-jupiters-tidal-forces-dictate-the-solar-cycle-suggests-new-study-52600>

> "Researchers from the Helmholtz-Zentrum Dresden-Rossendorf, a German Institute, have found evidence that the peculiarity of the regular solar cycle is to be found not within the Sun, but in its planets. Venus, Earth, and Jupiter have a tidal pull on our star that affects the hot plasma on its surface, much like the gravitational pull of the Moon affects tides on Earth. The team considered their regular alignment, every 11.07 years, to be the one keeping the tempo for the solar cycle. The model is published in the [journal Solar Physics](https://link.springer.com/article/10.1007/s11207-019-1447-1)."


---

### Answer by username_10 on 2017-04-25. Score: 2

As another answer says, there *is* a tendency to do a lot of algebra involving planets' periods. Another approach however is examining the timing of actual solar events. In [this](https://arxiv.org/abs/1702.00641) case, solar flares and their time distribution is related to the relative motion of Jupiter and Saturn, providing predictions.


---

