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Scientists use knowledge from BepiColombo flyby to find options inside Mercury’s magnetosphere

October 7, 2024
in NASA
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Scientists use knowledge from BepiColombo flyby to find options inside Mercury’s magnetosphere
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In June 2023, the joint European House Company (ESA) and Japanese Aerospace Exploration Company (JAXA) BepiColombo mission carried out a flyby of its goal planet — Mercury. In the course of the flyby, the spacecraft skilled quite a lot of phenomena primarily brought on by the planet’s magnetic discipline. BepiColombo measured these phenomena, offering scientists with a preview of Mercury’s magnetic discipline and its distinctive options, which BepiColombo is predicted to research in-depth when it enters orbit round Mercury in November 2026.

Whereas scientists have identified of Mercury’s magnetic discipline for many years, it’s roughly 100 occasions weaker on the planet’s floor than Earth’s magnetic discipline, and scientists nonetheless have many questions relating to its depth and interactions. Mercury’s magnetic discipline creates a “bubble” across the planet referred to as the magnetosphere, and given Mercury’s proximity to the Solar, this magnetosphere is continually bombarded with energized particles which can be ejected from the floor of the Solar.

When BepiColombo arrives at Mercury, the spacecraft will separate into two separate spacecraft — the Mercury Planet Orbiter (MPO), which is led by ESA, and the Mercury Magnetospheric Orbiter (MMO), which JAXA leads — and two separate orbits. Nevertheless, in the course of the flybys BepiColombo performs whereas en path to Mercury, the 2 spacecraft are nonetheless stacked, that means each spacecraft’s devices can observe components of Mercury they received’t be capable to when of their respective orbits. What’s extra, a few of BepiColombo’s flybys happen in areas that aren’t straight accessible from orbit.

The BepiColombo probe, that includes the MPO, MMO, and MTM modules. (Credit score: ESA)

Utilizing BepiColombo’s Mercury Plasma Particle Experiment (MPPE) suite of devices, a group of scientists led by Lina Hadid, a scientist on the Laboratoire de Physique des Plasmas at Paris Observatory and lead co-investigator of MPPE, constructed a snapshot of Mercury’s magnetosphere. Hadid et al. have been capable of gather the required knowledge in roughly half-hour throughout BepiColombo’s June 19, 2023 flyby, which was the spacecraft’s third of six whole Mercury flybys.

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“These flybys are quick; we crossed Mercury’s magnetosphere in about half-hour, shifting from nightfall to daybreak and at a closest method of simply 235 km above the planet’s floor. We sampled the kind of particles, how sizzling they’re, and the way they transfer, enabling us to obviously plot the magnetic panorama throughout this transient interval,” Hadid defined.

Hadid et al. mixed the MPPE measurements with laptop fashions to find out the origin of the magnetosphere particles detected by BepiColombo in the course of the flyby. Understanding the origin of those articles allowed the group to precisely sketch out Mercury’s magnetospheres and its varied options.

“We noticed anticipated constructions just like the ‘shock’ boundary between the free-flowing photo voltaic wind and the magnetosphere, and we additionally handed via the ‘horns’ flanking the plasma sheet, a area of hotter, denser electrically charged gasoline that streams out like a tail within the path away from the Solar. However we additionally had some surprises.”

“We detected a so-called low-latitude boundary layer outlined by a area of turbulent plasma on the fringe of the magnetosphere, and right here we noticed particles with a a lot wider vary of energies than we’ve ever seen earlier than at Mercury, in massive because of the sensitivity of the Mass Spectrum Analyser designed particularly for Mercury’s advanced setting. BepiColombo will be capable to decide the ion composition of Mercury’s magnetosphere in larger element than ever,” stated co-author and former BepiColombo instrument lead Dominique Delcourt.

The completely different options current inside Mercury’s magnetosphere throughout BepiColombo’s June 2023 flyby. (Credit score: ESA)

Along with these phenomena, Hadid et al. additionally famous the existence of a hoop present or an electrical present carried by charged particles which can be trapped inside a planet’s magnetosphere, inside a number of hundred kilometers of Mercury’s floor. Scientists aren’t fully positive how charged particles are being trapped inside a number of hundred kilometers of Mercury, particularly when the planet’s magnetosphere is pushed towards its floor. Earth has a hoop present current inside its magnetosphere, nonetheless, it extends tens of hundreds of kilometers from the planet’s floor — a lot farther than Mercury’s ring present.

“We additionally noticed energetic sizzling ions close to the equatorial airplane and at low latitude trapped within the magnetosphere, and we expect the one strategy to clarify that’s by a hoop present, both a partial or full ring, however that is an space that’s a lot debated,” stated Hadid.

Hadid et al.’s knowledge allowed BepiColombo groups to not solely observe the planet’s magnetosphere but in addition how the spacecraft interacted with the magnetosphere and the encompassing area plasma. For instance, when BepiColombo is being heated by the Solar, the spacecraft can’t detect colder, heavier ions as a result of spacecraft being electrically charged, which repels the ions. Nevertheless, when the spacecraft just isn’t being heated by the Solar and is within the shadow of Mercury, a sea of chilly plasma ions covers the spacecraft and turns into seen as a result of spacecraft’s charging being completely different. In the course of the June 2023 flyby, BepiColombo detected ions of oxygen, sodium, and potassium. These ions have been probably despatched flying from Mercury’s floor as a result of planet’s interactions with photo voltaic wind or micrometeorite strikes on the floor.

“It’s like we’re instantly seeing the floor composition ‘exploded’ in 3D via the planet’s very skinny ambiance, referred to as its exosphere. It’s actually thrilling to start out seeing the hyperlink between the planet’s floor and the plasma setting,” Delcourt defined.

Simulated view of Mercury’s magnetosphere. (Credit score: Willi Exner – ESA & TU Braunschweig)

Hadid et al.’s outcomes spotlight the significance of the BepiColombo mission and its means to characterize the closest planet to the Solar. Along with offering scientists with huge insights into planetary magnetospheres and the science behind them, BepiColombo will reveal extra about how Mercury shaped and advanced.

“The observations emphasize the necessity for the 2 orbiters and their complementary devices to inform us the complete story and construct up a whole image of how the magnetic and plasma setting adjustments over time and in area,” stated ESA BepiColombo mission scientist Geraint Jones.

Because the June 2023 flyby, BepiColombo has accomplished its fourth flyby of Mercury, and the mission’s scientists have already begun analyzing the information collected by the spacecraft in the course of the flyby. BepiColombo’s ultimate two Mercury flybys are scheduled for Dec. 1, 2024, and Jan. 8, 2025.

(Lead picture: BepiColombo and its trajectory via Mercury’s magnetosphere. Credit score: ESA)



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