'Ribbon’ wraps up mystery of Jupiter’s magnetic equator

New data from Jupiter observations is a gift to Leicester astronomers.
The discovery of a dark ribbon of weak hydrogen ion emissions that encircles Jupiter has overturned previous thinking about the giant planet’s magnetic equator.

An international team of scientists led by Dr Tom Stallard from the Department of Physics and Astronomy has identified the weakened ribbon of H3+ emissions near the jovigraphic equator using the NSFCam instrument at the NASA InfraRed Telescope Facility. Published online by Nature Astronomy today, it marks the first evidence of a localised ionospheric interaction with Jupiter’s magnetic field.

In the past, studies of Jupiter’s ionosphere have almost exclusively focused on the poles of the planet, looking at the aurorae. These observations saw most of Jupiter’s ionosphere as relatively smooth and uninteresting.

This latest study has opened up the entire ionosphere for investigation and suggests that Jupiter’s ionosphere is as complex as our observations are able to measure with levels of details still yet to be revealed. It also demonstrates that, despite the differences in their size and structure, both Earth and Jupiter have a similar localised ribbon that winds its way around the magnetic equator of the planet. Recent data from NASA’s Juno spacecraft supports the theory that this ribbon is a signature for Jupiter’s magnetic equator.

The observations identified a number of other localised dark regions, including the area identified last year as the Great Cold Spot by the same team of scientists.

The ionosphere is the ionized part of Jupiter’s upper atmosphere. Here, collisions between photoelectrons and H2 are a significant source of H3+ ions.

One explanation for the dark ribbon is that because electrons preferentially travel along magnetic field lines, these photoelectrons are diverted to higher latitudes from the magnetic equator as they move to lower altitudes – leaving behind the ribbon of reduced H3+production.

Credit:
University of Leicester



'Identification of Jupiter’s magnetic equator through H3+ ionospheric emission' is published by Nature Astronomy on 23 July 2018. DOI: 10.1038/s41550-018-0523-z


Image:
Three different measurements of Jupiter’s magnetic equator: the first, in blue, is the best past estimate of what was thought to be the equator using ultraviolet light; the second, in red and yellow is the location of the dark ribbon seen in this map; the third is the new measurement of the magnetic equator recently measured by the Juno spacecraft.


Find more, and see video (in 00:36) of a projection of the map of Jupiter’s ionosphere, highlighting the aurorae, Great Cold Spot and magnetic equator at:
https://www2.le.ac.uk/news/blog/2018-archive/july/ribbon2019-wraps-up-mystery-of-jupiter2019s-magnetic-equator

You can see video of a projection of the map of Jupiter’s ionosphere, ...
in 00:36 on YT:
https://youtu.be/yTx7KbO76ws


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Happy Birthday Leo if you're born today or you are a 2* Leo Rising and you can try to analyze, calculate, run the numbers and get advice about a relationship or special set of circumstances in your life. But you already know the answer. During your Birthday Solar Return you'll find things accelerate and perhaps it's true there is a speeding up of karma now. Things are brought to your attention and maybe you find yourself repeating situations and experiences from Nov. 2016. Next time Mars swings around to this position in about 2 yrs, April 2020 you'll be better prepared for it. Life is cyclical. The stars suggest if you know where something is headed based on past experiences apply what you've learned in the past to what's going on right now. It's about attachments, procrastination and not listening to your higher self and putting yourself first. Take care of health matters and rid yourself of unnecessary stress. Let go. there's only more suffering in bad attachments to bad relationships. Your focus should be on your job, work, health and getting ahead. You have a great opportunity to be very successful, very quickly.

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