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      Home News Satellite/Comms

      Hope probe discovers ‘patchy’ Mars proton aurora

      Staff Reporter by Staff Reporter
      September 1, 2022
      in Satellite/Comms
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      Through a data-sharing partnership with NASA’s Maven mission, scientists were able to study the planet’s plasma environment while the aurora was happening.

      The Emirates Mars Mission (EMM) has discovered patchy ‘proton auroras’ above Mars, suggesting unexpectedly chaotic conditions where the solar wind interacts with the Red Planet’s upper atmosphere.

      The spatially variable ‘patchy’ proton aurora potentially triggers new insights into unexpected behaviours in the Martian atmosphere. The EMM team has worked together with NASA’s Maven (Mars Atmosphere and Volatile Evolution) mission to fully characterise these observations. The combination of EMM’s unprecedented global aurora images with Maven’s simultaneous local plasma observations opens up new avenues for understanding the drivers of Mars’ enigmatic aurora.

      Hessa Al Matroushi, EMM’s Science Lead, said: “Our discovery of this patchy proton aurora adds a new kind of event to the long list of those currently studied by EMM and challenges our existing views of how the proton aurora on Mars’ dayside are formed. The EMM Hope probe has so far uncovered many unexpected phenomena that extend our understanding of Mars’ atmospheric and magnetospheric dynamics. These new observations, combined with Maven data, have lifted the lid on entirely new possibilities for scientific research.”

      This new patchy type of proton aurora is formed when the solar wind directly impacts Mars’ dayside upper atmosphere and emits ultraviolet light as it slows down. It was discovered in snapshots of the dayside disk obtained by the Emirates Mars Ultraviolet Spectrometer (EMUS), which observes the planet’s upper atmosphere and exosphere, scanning for variability in atmospheric composition and atmospheric escape to space. The aurora manifests as bright regions scattered across the dayside of the planet in two ultraviolet wavelengths associated with the Hydrogen atom, Lyman beta at 102.6 nm and Lyman alpha at 121.6 nm. Under normal conditions, the dayside disk of the planet at these wavelengths is uniform, and the planetary brightness results from Hydrogen atoms scattering sunlight. When the aurora occurs, small regions of the planet become much brighter at these wavelengths, signifying intense localised energy deposition in the atmosphere.

      EMM science team member and lead author of a newly submitted paper on the proton aurora, Mike Chaffin, added: “We’ve seen emissions at these wavelengths before, thanks to proton aurora studies by NASA’s Maven mission, but these EMM EMUS images represent the first time we’ve had a global view of spatial variability in proton aurora at Mars, and the first time we’ve been able to unambiguously observe this patchy structure. We know that these wavelengths are only emitted by the Hydrogen atom, which tells us that super energetic Hydrogen atoms must be present in the atmosphere in order to produce the auroral emission.”

      A data-sharing agreement between EMM and MAVEN has enabled analysis of the new EMM images using plasma observations made by Maven, which has been characterising the Mars ionosphere and magnetosphere since 2014. Maven carries a full suite of plasma instruments, including a magnetometer and two ion electrostatic analysers that measured the Martian plasma and fields environment during EMM’s observations of patchy proton aurora events.

      Maven Principal Investigator Shannon Curry stated: “Multi-vantage point measurements of the Martian atmosphere tell us about the real-time response of the atmosphere to the Sun. These types of simultaneous observations probe the fundamental physics of atmospheric dynamics and evolution.”

      Al Matroushi added: “Access to Maven data has been essential for placing these new observations into a wider context. Together, we’re pushing the boundaries of our existing knowledge not only of Mars, but of planetary interactions with the solar wind.”

      Martian proton auroras were originally discovered by Maven and subsequently found in data from ESA’s Mars Express mission, but most of these previous observations show uniform auroral emission across the dayside of the planet. By contrast, the EMUS observations are able to unambiguously reveal small-scale spatial structure. Scientists from both teams now believe the patchy aurora can only be produced by plasma turbulence in the space surrounding Mars. “Because of the size scales involved in the solar wind and extended hydrogen atmosphere of Mars, there’s no way the standard proton aurora formation mechanism could produce the aurora we’re observing with EMUS,” said Chaffin.

      “In the August 11 observations, the aurora is so widespread and so disorganised that the plasma environment around Mars must have been truly disturbed. Thanks to Maven measurements of the Mars plasma environment simultaneous with the aurora, we can confidently say that the solar wind is directly impacting the upper atmosphere wherever we’re seeing auroral emission,” he added. “What we’re seeing is essentially a map of where the solar wind is raining down onto the planet.”

      The simultaneous observations of patchy proton aurora by Hope and measurements of plasma conditions by Maven are therefore a window into rare circumstances, when the interaction between Mars and the solar wind is unusually chaotic.

      Hope has observed a patchy aurora multiple times over the course of its mission so far, and the shape of the aurora is not always the same. On 30th August 2021, for example, the patchy proton aurora was confined to a much smaller portion of the disk than on 11th August, suggesting a different mechanism may be at work. Plasma turbulence at Mars can occur under a variety of conditions, and different shapes of patchy proton aurora may reveal different plasma conditions.

      As of June 2022, Mars is about a month away from the peak of its Southern Summer, when proton aurorae are known to be at their most active. “Whether we’ll see anything as spectacular as what we’ve already got is anyone’s guess, but I’m hopeful. Hope continues to far exceed our expectations for scientific discovery, and I can’t wait to see what we learn next,” said Chaffin.

      Tags: Mars auroraproton aurorasMartian proton aurorasHope ProbeMars MissionEmirates Mars MissionMars proton auroraMaven dataEMM Hope probe

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