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Back-tracing of water ions at comet 67P/Churyumov–Gerasimenko
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik.
2017 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
Abstract [en]

This paper examines the neutral coma of comet 67P/Churyumov–Gerasimenko by using measurements of charged particles (water ions) and tracing them back to their place of ionisation. The measurements were taken from Rosetta’s Ion Composition Analyser. The simulations made use of an existing program which traces particles forward, which was changed to trace particles backwards, with new conditions for terminating the simulation.

Two types of simulations were made. The first type is referred to as ”one-day simulations”. In these, simulations are made using data from a single occasion, with nine occasions studied per selected day. The days were selected so that the spacecraft was in different positions in relation to the comet. The second is referred to as the ”full-hemisphere” simulation. In this simulation, data from all usable days are used to produce an image of the hemisphere facing the Sun.

The full-hemisphere simulation suffers from lack of simultaneous measurements, and indeed it is impossible to obtain in-situ measurements at all positions at once. Both simulations could be improved using more precise models, which could not be done within the allotted time of this work.

sted, utgiver, år, opplag, sider
2017.
Emneord [en]
Rosetta, plasma, solar system
Emneord [sv]
Rosetta, plasma, solsystemet
HSV kategori
Identifikatorer
URN: urn:nbn:se:ltu:diva-67050OAI: oai:DiVA.org:ltu-67050DiVA, id: diva2:1167480
Eksternt samarbeid
Belgian Institute for Space Aeronomy
Utdanningsprogram
Space Engineering, master's level
Veileder
Examiner
Tilgjengelig fra: 2017-12-21 Laget: 2017-12-18 Sist oppdatert: 2017-12-21bibliografisk kontrollert

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