The moon exerts a previously unknown tidal force on the “plasma ocean” surrounding Earth’s upper atmosphere, creating fluctuations that are similar to the tides in the oceans, a new study suggests.
In the study, published Jan. 26 in the journal Nature Physics (opens in new tab) , scientists used more than 40 years of data collected by satellites to track the minute changes in the shape of the plasmasphere, the inner region of Earth’s magnetosphere, which shields our planet from solar storms and other types of high-energy particles.
The plasmasphere is a roughly doughnut-shaped blob of cool plasma that sits on top of Earth’s magnetic field lines, just above the ionosphere, the electrically charged part of the upper atmosphere. The plasma, or ionized gas, in the plasmasphere is denser than the plasma in the outer regions of the magnetosphere, which causes it to sink to the bottom of the magnetosphere. The boundary between this dense sunken plasma and the rest of the magnetosphere is known as the plasmapause.
“Given its cold, dense plasma properties, the plasmasphere can be regarded as a ‘plasma ocean,’ and the plasmapause represents the ‘surface’ of this ocean,” the researchers wrote in the paper. The moon’s gravitational pull can distort this “ocean,” causing its surface to rise and fall like the ocean tides.
Related: Colossal asteroid impact forever changed the balance of the moon
The moon is already known to exert tidal forces on Earth’s oceans, crust, near-ground geomagnetic field and the gas within the lower atmosphere. However, until now, nobody had tested to see if there was a tidal effect on the plasmasphere.
To investigate this question, the researchers analyzed data from more than 50,000 crossings of the plasmasphere by satellites belonging to 10 scientific missions, including NASA’s Time History of Events and Macroscale Interactions during Substorms (THEMIS) mission. The satellites’ sensors are capable of detecting minute changes in the concentrations of plasma, which allowed the team to map out the exact boundary of the plasmapause in greater detail than ever before.
The satellite crossings occurred between 1977 and 2015, and during this period, there were four complete solar cycles. This information allowed the team to factor in the role of solar activity on Earth’s magnetosphere. Once the sun’s influence was accounted for, it started to become clear that fluctuations in the shape of the plasmapause followed daily and monthly patterns that were very similar to the ocean’s tides, indicating that the moon was the most likely cause of the plasma tides.
The researchers are unsure exactly how the moon causes the plasma tides, but their current best guess is that the moon’s gravity causes perturbations in Earth’s electromagnetic field. But further research is needed to tell for sure.
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The team thinks this previously unknown interaction between Earth and the moon could help researchers understand other parts of the magnetosphere in greater detail, such as the Van Allen radiation belts, which capture highly energetic particles from solar wind and trap them in the outer magnetosphere.
“We suspect that the observed plasma tide may subtly affect the distribution of energetic radiation belt particles, which are a well-known hazard to space-based infrastructure and human activities in space,” the researchers wrote. Better understanding the tides could therefore help to improve work in these areas, they added.
The researchers also want to see if plasma in the magnetospheres of other planets is influenced by those planets’ moons. “These findings may have implications for tidal interactions in other two-body celestial systems,” they wrote.
A man has been detained in Leeds after being “seen with weapons” and three people were left injured.
Police were called to Otley Road at 2.47pm on Saturday to reports of a “serious incident involving a man seen with weapons”, West Yorkshire Police said.
Officers arrived at the scene to find three people injured and a man was detained at the scene, the force said. The injuries are not believed to be life-threatening.
Image: Officers inside the cordon in Leeds
Image: Officers guard one of the crime scenes
Image: An ambulance inside one of the cordons
Inquiries are under way to establish the “wider circumstances” and a “number” of crime scenes remain in place, they added.
This breaking news story is being updated and more details will be published shortly.
Wrexham AFC have been promoted for the third season in a row.
The North Wales-based side has gone from the National League to the Championship in just three seasons, under its Hollywood owners Ryan Reynolds and Rob McElhenney.
Wrexham were second in the table and had a run of eight games unbeaten ahead of their match against Charlton Athletic on Saturday, which they won 3-0.
Image: Wrexham’s James McClean lifts the League One trophy. Pic: PA
Image: Wrexham’s Dan Scarr celebrates with the fans on the pitch after Wrexham won promotion to the Championship. Pic: PA
It is the first time any club has been promoted for three consecutive seasons within the top five tiers of English football.
The third oldest association football club in the world, Wrexham AFC was bought by Reynolds and McElhenney in 2020, and has since been the subject of a Disney+ documentary, Welcome To Wrexham.
Reynolds, wearing a Wrexham sweatshirt, and McElhenney were pictured celebrating each goal, and after the game, as the fans came onto the pitch at the SToK Cae Ras (Racecourse Ground) to celebrate the victory with the players.
Image: Wrexham co-owners Rob McElhenney (L) and Ryan Reynolds and Ryan’s wife Blake Lively, before the match. Pic: PA
Both stars came onto the pitch after the supporters returned to the stands.
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Speaking to Sky Sports, McElhenney praised those behind the scenes, referring to “so many that don’t get the credit they deserve, people who aren’t talked about”.
Reynolds said bringing success back to the club “seemed like an impossible dream” when they arrived in North Wales in 2020.
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Image: Wrexham’s Sam Smith celebrates in front of the fans after Wrexham won promotion to the Championship. Pic: PA
He put the three promotions down to “the coaching staff, the greatest dressing room” and an “all for one, one for all” attitude throughout the club, adding he was “speechless with their commitment and their emotion”.
As for the mouth-watering prospect of another promotion to the promised land of the Premier League, the pair agreed it was “for tomorrow”, before ending the interview with a joint mic-drop.
Veteran striker Steven Fletcher said, “as soon as I came to this club, I knew it was something special. We want to go again. We’ll reset in the summer, take a break and go again”.
Along with Tennessee Tech, Tennessee-based ultralight aircraft company Whisper Aero has secured a $500,000 grant to help advance the company’s innovative electric jet motor concept off the drawing board and onto the testing phase.
Earlier this month, the Tennessee Department of Economic and Community Development (TNECD) announced plans to award $500,000 to Tennessee Tech and Whisper Aero through the Transportation Network Growth Opportunity (TNGO) initiative.
“We look forward to using these award dollars to place students in internships working directly with Whisper Aero leaders,” said Tennessee Tech President Phil Oldham. “By learning from an electric propulsion innovator like Whisper Aero, our students will gain invaluable perspective and can take what they have learned in the classroom and apply it right here in Tennessee.”
The grant will see a Whisper Aero glider fitted with a pair of the company’s eQ250 electric-powered jet “propulsors” for UltraQuiet flight. Tennessee Tech faculty and students will carry out copper-bird ground testing to ensure the safe integration of engines, batteries, and controllers, and kickstart Tennessee Tech’s new Crossville Mobility Incubator.
Whisper Aero’s main claim to fame is its innovative UltraQuiet WhisperDrive (above). It’s effectively an electrically spun ducted fan jet engine that uses a large number of stiff composite fan blades inside a lightweight, acoustically treated duct. With so many blades, the Whisper Aero propulsor can push more air than a conventional prop while spinning much more slowly. As such, the “blade passage frequency” moves up to more than 16,000 Hz – outside the range of most human hearing but not, supposedly, high enough to freak out the beagles.
The Whisper Aero ultralight is effectively an Aériane Swift3 glider fitted with a pair of Whisper’s eQ250 propulsors, each capable of up to 80 lbs. of thrust. The Ultralight has a wingspan of over 40 ft with a maximum L/D of 35:1 and can be stressed to a design loading of +6/-4g, making it capable of some pretty impressive acrobatic feats.
The Swift3 glider is designed for a low speed, low power cruising speed of 45–55 knots with “just” 6.5 hp. Power-off glides from a few hundred feet showed a low sink rate, and a climb rate of 1,250 ft/min with full self-launching power (in other words: the Whisper glider doesn’t have to be towed by a launch vehicle, like a conventional ultralight glider).
Quiet cool
Dual WhisperDrive fans deliver ~160 lbf of thrust; via Whisper Aero.
Range under full power is about 109 miles with current battery tech, but it’s expected that range under the latest EPiC 2.0 energy batteries would rise to nearly 170 miles.
Nathan Millecam, CEO of Electric Power System, said, “EPiC 2.0’s leap in energy density and thermal performance has enabled a significant increase in range, a clear validation of our next-gen cell technology. We are impressed by what the Whisper team continues to achieve in advancing electric aviation.”
The press release concludes explaining that flight tests are expected to show that the Whisper Aero glider can be flown, “a few hundred feet away from neighborhoods without any disturbances, while carrying a 220 lbs. payload with full range,” which is all kind of ominous in today’s political climate, but still pretty neat from a purely tech perspective.
With support from TNECD’s Transportation Network Growth Opportunity (TNGO) initiative, Tennessee Tech University and Whisper Aero are partnering to advance next-generation propulsion technology in the aerospace industry. This collaboration will enhance aerospace research and workforce development, ensuring Tennessee remains a leader in cutting-edge mobility solutions.
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