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Statistical analysis of the electric field measurements from the Rosetta spacecraft in the plasma environment of comet 67P/Churyumov-Gerasimenko
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Comets are a key to understanding the early stages of the solar system. They were hereat its formation and have not evolved ever since, which means they are our best shotat learning the processes that led to the formation of the solar system as we know ittoday. Yet, our knowledge about these bodies is very limited. They are far from theEarth and small, which makes it complicated and expensive to reach them. But thestudy of the chemistry and geology of comets is not the only goal of the scientific community.The plasma environment of these astronomical bodies could also give answersto many questions regarding the science of plasma physics, such as the interaction ofthe solar wind with plasmas. Answering some of these questions was an objectiveof the Rosetta Mission. Before its launch, only three space missions out of eight targettingcomets had plasma instruments onboard. Rosetta carried several instrumentsdesigned to analyse the plasma environment of comet 67P/Churyumov-Gerasimenko.We were able to perform a statistical analysis of the electric field spectrum in the vicinityof comet 67P/Churyumov-Gerasimenko. This allowed us to determine two regionsof high spectral activity using the two probes of the LAP instrument and to proposeseveral theories about the physical processes that were active.

Abstract [sv]

Kometer är en nyckel till att förstå solystemets tidiga stadier. De var här under desstillkomst och har inte utvecklats sedan dess, vilket innebär att de är en av våra bästamöjligheter att lära oss om de processer som ledde till bildandet av solsystemet. Ändåär vår kunskap om dessa kroppar väldigt begränsad. De är långt från jorden och små,vilket gör det komplicerat och dyrt att nå dem. Men studier av kometers kemi ochgeologi är inte det enda målet för det vetenskapliga samfundet. Plasmamiljön hosdessa astronomiska kroppar kan också ge svar på många frågor om vetenskapen omplasmafysik, såsom växelverkan mellan solvinden och plasman. Målet för Rosetta-uppdraget var att svara på några av dessa frågorna. Innan dess uppskjutning vardet bara bara tre av åtta rymdsonder som skickatts till kometer som bar plasmainstrument.Rosetta hade flera instrument ombord för att analysera plasmamiljön hoskometen 67P/Churyumov-Gerasimenko. Vi kunde utföra en statistisk analys av detelektriska fältets spektrum i plasmamiljön runt kometen. Detta tillsammans med användningenav de två sonderna på LAP-instrumentet gav oss möjligheten att bestämmatvå regioner med hög spektral aktivitet, samt möjligheten att föreslå flera teorier om defysikaliska processerna som var aktiva.

Place, publisher, year, edition, pages
2017. , p. 64
Series
TRITA-EE, ISSN 1653-5146 ; 2016:200
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-202374OAI: oai:DiVA.org:kth-202374DiVA, id: diva2:1076208
Educational program
Master of Science - Electrophysics
Available from: 2017-02-22 Created: 2017-02-22 Last updated: 2017-02-22Bibliographically approved

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