Constant velocity field and radial component of background magnetic field at 0.9 RJ. The hummock-area bump is with the central meridian at 180° in coordinate system III (highlighted in gray). The central meridian is the zero line for steady flow. The color scale for the linear background magnetic field model is specified between The current velocity is scaled with latitude to account for the polar convergence of the meridians. The peak velocity (corresponding to the equatorial jet) is 0.86 cm/s-1. Credit: Nature (2024). DOI: 10.1038/s41586-024-07046-3
A team of planetary scientists from several institutions in the United States has found a jet in Jupiter's atmosphere that oscillates in roughly four-year periods. In their paper, published in the journal Nature, the group describes how to find the jet and examine its properties using data from the Juno spacecraft.
Jupiter has a large magnetosphere, some parts of which extend to the orbit of Saturn. The planet's magnetic field is about 20 times that of Earth, making it a good target for research. Also, the fact that Jupiter is a gas giant and has no shell makes it a good target. This makes it much easier to study the dynamics that are responsible for maintaining the magnetosphere compared to the dynamics that generate the Earth's magnetic field.
NASA sent a probe specifically designed to measure and map the planet's magnetic field — the Juno probe launched in 2011 and entered Jupiter's polar orbit in 2016. Since then, it has sent back valuable information about many aspects of the planet, including Magnetic field. In this new effort, the researchers focused on data surrounding an atmospheric jet.
Wind speeds can cause atmospheric jets to create high-speed currents that sweep through the planet's atmosphere, similar in some ways to the jet stream on Earth. In this new effort, the research team focused on a jet in a circular region on Jupiter called the "Great Blue Spot." By studying data describing the jet's properties, the researchers found that it has wave-like oscillations that repeat in roughly four-year periods.
Convective currents from within the metallic hydrogen pool that forms part of the planet's inner atmosphere. Such a jet would almost certainly have periodicity in centuries, not years.
James Garry added a reply
Mr Kashani,
You have seemingly copied from a number of articles to make this post:
https://ausinsumet.biz.id/news/2024/03/07/jet-in-jupiters-atmosphere-appears-to-fluctuate-in-periods-of-about-four-years/
and
https://phys.org/news/2024-03-jet-jupiter-atmosphere-fluctuate-roughly.html
This post is shown in my 'Question' feed, and I do not know what you want to know.
What is the question you ask?
Abbas Kashani added a reply
Dear James Garry
Jet in Jupiter's atmosphere found to fluctuate in roughly four-year periods.
And this issue shows that if the speed increases in Jupiter's atmosphere, it is due to what factors and the role of magnetism is effective in the wind speed in the jet. Thank you for your attention
James Garry added a reply:
Mr Kashani,
Note, the magnetosphere cannot couple to a non-current carrying fluid - and as Jupiter's atmosphere (at least, visible cloud layer) is essentially insulating, the magnetosphere cannot directly act on the atmosphere.
In the exosphere, that's not the case. There, the 'atmosphere' is partially ionized.
But I still don't know what question you are asking.
Aahed Alhamamy added a reply:
Abbas Kashani
Here is what I know about jet streams and magnetic forces on Jupiter compared to Earth:
The jet streams on Jupiter are significantly stronger than Earth's jet streams. Jupiter's equatorial jet stream extends up to 400 miles per hour, over twice as fast as the strongest jet streams on Earth which typically max out around 200 mph.
This is due to several factors. Jupiter is much more massive than Earth, which means it rotates faster and has less friction in its thicker atmosphere to slow down wind speeds. Jupiter also receives more solar energy from the Sun due to its proximity, heating its atmosphere and contributing to more dynamic weather.
In terms of magnetic forces, Jupiter has an enormously strong magnetic field generated by convection currents in its liquid metallic hydrogen interior. Its magnetic field is over 10 times more powerful than Earth's. This massive magnetic field traps and channels ionized particles from the Sun into a polarized magnetic field around the planet.
The interaction between Jupiter's magnetic field and the solar wind creates intense auroras near its polar regions, similar to Earth's northern and southern lights. However, Jupiter's auroras are much more extensive and energetic due to the greater magnetic forces at play. The magnetic field also helps shield Jupiter's atmosphere from some cosmic radiation.
Finally we can say : both Jupiter's jet streams and magnetic field are amplified significantly compared to Earth's due to Jupiter's larger size, faster rotation rate, and different internal composition. Let me know if you need any clarification or have additional weather or planetary questions!
On the planet Venus, it takes 243 Earth days for the surface of the planet to make a complete rotation around its axis. But Venus' burning atmosphere completes this rotation 60 times faster than its surface.
According to my core model: the magnetism of the planet's core definitely affects the rotation of the atmosphere.
Important: Core and shell magnetism are different. I proved the reason with my calculations.
On Venus, the magnetism of the core is much stronger than the magnetism of the shell. Even the magnetism of the core of Venus is greater than the magnetism of the Earth's core.
My dear Arash Azad
Independent researcher
England
Greetings and courtesy and respect, thank you very much for your answer and only I meant the planet Jupiter, not the planet Venus. In any case, I am interested in your answer. Thank you Abbas.