Million-fold increase in the power of waves near Jupiter’s moon Ganymede
Listening to electromagnetic waves around the Earth, converted to sound, is almost like listening to singing and chirping birds at dawn with a crackling campfire nearby. Such waves are therefore called chorus waves.
They cause the Northern Lights, but also high-energy ‘killer’ electrons that can damage spacecraft. In a recent study to be published in Nature Communications, the authors describe extraordinary chorus waves around other planets in our solar system.
The scientists led by Yuri Shprits of GFZ and the University of Potsdam report that the power of chorus waves is 1 million times more intense near the Jovian moon Ganymede, and 100 times more intense near the moon Europa than the average around these planets. These are the new results from a systematic study on Jupiter’s wave environment taken from the Galileo spacecraft.
“It’s a really surprising and puzzling observation showing that a moon with a magnetic field can create such a tremendous intensification in the power of waves,” says the lead author of the study, Professor Yuri Shprits of GFZ/ University of Potsdam, who is also affiliated with UCLA.
Chorus waves are a special type of radio wave occurring at very low frequencies. Unlike the Earth, Ganymede and Europa orbit inside the giant magnetic field of Jupiter, and the authors believe this is one of the key factors powering the waves. Jupiter’s magnetic field is the largest in the solar system, and some 20,000 times stronger than the Earth’s.
“Chorus waves have been detected in space around the Earth, but they are nowhere near as strong as the waves at Jupiter,” says Professor Richard Horne of British Antarctic Survey, a co-author on the study. “Even if small portion of these waves escapes the immediate vicinity of Ganymede, they will be capable of accelerating particles to very high energies and ultimately producing very fast electrons inside Jupiter’s magnetic field.”
Jupiter’s moon Ganymede was first found to have a magnetic field by Professor Margaret Kivelson and her team at the University of California, Los Angeles, and strong plasma waves were first observed near Ganymede by Professor Don Gurnett and his team at the University of Iowa. However, until now, it remained unclear if this was accidental or whether such increases are systematic and significant.
Around Earth, chorus waves play a major role in producing high-energy ‘killer’ electrons that can damage spacecraft. The new observations raise the question as to whether they can do the same at Jupiter.
Observations of Jupiter’s waves provides a unique opportunity to understand the fundamental processes that are relevant to laboratory plasmas and the quest for new energy sources, and processes of acceleration and loss around the planets in the solar system. Similar processes may occur in exoplanets orbiting other stars, and the findings of this study may help to detect whether exoplanets have magnetic fields by providing very important observational constraints for theoretical studies to quantify the increase in wave power.
Explore further: Pulsating aurora mysteries uncovered with help from NASA’s THEMIS mission
More information: Y. Y. Shprits et al, Strong whistler mode waves observed in the vicinity of Jupiter’s moons, Nature Communications (2018). DOI: 10.1038/s41467-018-05431-x
Read more at: https://phys.org/news/2018-08-million-fold-power-jupiter-moon-ganymede.html#jCp
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Joseph A Olson
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“Electric Universe” science team has convincing evidence on magnetism and electrical force field interactions within our little solar system. Strawmen Lukewarmists, like Tony “BlogBully” Watts obstinately refuse discussion of these obvious relationships. In fact, BlogBully Watts went so far as to AUTO-BAN any comment that included the words, or phrases….
Electric Universe….Slayers….Faux Science….Principia Scientific.. and more….
I met BlogBully at Heartland ICCC-9, I challenge this science impaired Lukewarmist gatekeeper to debate Thermodynamics and Radiation Physics anytime. My review of the goofy ICCC-9
“Mommie, Can We Play Obombie Truth Origami” at FauxScienceSlayer website
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James McGinn
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JO:
“Electric Universe” science team has convincing evidence on magnetism and electrical force field interactions within our little solar system. Strawmen Lukewarmists, like Tony “BlogBully” Watts obstinately refuse discussion of these obvious relationships. In fact, BlogBully Watts went so far as to AUTO-BAN any comment that included the words, or phrases….”
JMcG:
LOL. How is PSI any different? You are all too naïve to see that AW is part of a larger pseudoscientific conspiriacy that you yourselves are part and parcel.
Watts is a meteorologists. Much if not most of meteorology is not actually scientific rather it is conversational. Or, to put it another way, most of meteorology is not empirical but conjectural. They don’t measure or test notions like convection, dry layer capping, or latent heat. They talk about it. And if you talk about scientific notion long enough it eventually becomes sacred–beyond dispute. You PSI wannabees are perfectly blind to this. So you are in no position to be dumping on AW.
It’s important to remember that all climatologists were trained as meteorologists first. The intellectual strategic tactic of pretending to understand what actually doesn’t make sense and has never been measured or tested is a tactic that meteorology developed and has been grandfathered into climatology. Climatologists learned to play fast and loose with the truth from meteorologists–because they are meteorologists.
All meteorologists (including Hertzberg) are phoney scientists–not just Anthony Watt. All meteorologists use tactics to fool the public into thinking that their untested and undefined modelling assumptions are sound science.
You whiney pretenders whine on and on about the fact that CO2 forcing is not reconcilable with standard empirical sciences, like thermodynamics. But you are not honest. All of meteorological theory on storms and atmospheric flow is not reconcilable. But you simpletons never draw attention to this.
Nothing is more obvious but that the agenda of PSI is ideologically selective, and not empirically comprehensive.
https://www.thunderbolts.info/forum/phpBB3/viewtopic.php?f=10&t=16597#p117256
James McGinn / Solving Tornadoes
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