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IRON AND ICE
New opportunities to study ions in space
by Staff Writers
Umea, Sweden (SPX) Nov 26, 2021

"For the first time, we have now been able to determine the flow directions of low-energy ions observed by ICA at comet 67P/Churyumov-Gerasimenko", Sofia Bergman says. "The results were surprising. We see a large amount of ions flowing inward towards the comet nucleus, instead of outward as we had expected."

Comets have an environment of plasma which contains a large number of ions with low energies. It is necessary to understand these low-energy ions' properties in order to understand the physical processes occurring around the comet.

As low-energy ions are difficult to measure Sofia Bergman devised a new method to analyze measurements of these ions around comet 67P/Churyumov-Gerasimenko in her thesis.

"A spacecraft interacts with its environment, which leads to an accumulation of charge on the surface of the spacecraft. This is problematic for the measurements of low-energy ions, since the ions are affected by the spacecraft before they are detected, changing both their energy and travel direction. We want to know the original properties of the ions, before they were affected by the spacecraft, which is now possible with the method that I have developed in my thesis", Sofia Bergman explains.

In the thesis, data from IRF's ion mass spectrometer ICA (Ion Composition Analyzer) on board Rosetta have been analysed. ICA can measure the energy and travel direction of ions with very low energies, but because of the influence of the spacecraft potential on the measurements the low-energy data from ICA have previously been difficult to interpret.

"For the first time, we have now been able to determine the flow directions of low-energy ions observed by ICA at comet 67P/Churyumov-Gerasimenko", Sofia Bergman says. "The results were surprising. We see a large amount of ions flowing inward towards the comet nucleus, instead of outward as we had expected."

Comets are interesting to study when we want to understand how the solar wind is interacting with different bodies in the Solar System. The comets' elliptical orbits cause the environment around them to change dramatically. As the distance from the comet to the Sun changes, we can observe how a magnetosphere is being formed around the comet. Low-energy ions are important for this interaction and not only at comets:

"The method that I have developed in my thesis can also be used to study low-energy ions around other bodies in the Solar System. The analysis of such ions has previously been very limited due to the difficulties of interpreting the measurements", says Sofia Bergman.

Sofia Bergman was born and raised in Borlange, Sweden.

Research Report: "Low-Energy Ions Around Comet 67P/Churyumov-Gerasimenko"


Related Links
Umea University
Swedish Institute of Space Physics
Asteroid and Comet Mission News, Science and Technology


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IRON AND ICE
Laboratory will illuminate formation, composition, activity of comets
Boston MA (SPX) Nov 04, 2021
Comets are icy and dusty snowballs of material that have remained relatively unchanged since they first formed billions of years ago. Studying the small bodies provides clues about the formation of the solar system. In Review of Scientific Instruments, by AIP Publishing, researchers from the Technische Universitat Braunschweig, the Austrian Academy of Science, the University of Bern, the German Aerospace Center, and the Max Planck Institute for Solar System Research developed a laboratory to simul ... read more

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