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Instrumental and environmental effects on RPC-ICA measurements of the cometary ion dynamics at comet 67P/CG
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik. Swedish Institute of Space Physics. (Solar System Physics and Space Technology)
2017 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
Abstract [en]

Observations provided from RPC-ICA in combination with the data from RPC-MAG and ROSINA-COPS show that many aspects of the time variability of the detected ions is correlated with the magnetic field or -- to a smaller extent -- with neutral atmosphere density. We also show that not all changes in the cometary ion data reflect the nature of the plasma dynamics, but are a consequence of the instrumental limitations. The main outcome of the article in Appendix 1 is that the cometary ions can be divided into two populations with distinct characteristics. One population we termed the convecting population, is accelerated to higher energies through the interaction with the solar wind. The other population we termed the expanding population is moving radially away from the nucleus in the terminator plane. Both populations exhibit a significant anti-sunward component.In addition we present in this thesis a case with observations day-side of the terminator plane. There we show how the expanding population has a sunward component, consistent with initial radial expansion of the ions from the nucleus which gradually turn into an anti-sunward flow which is then observed in the terminator plane.

sted, utgiver, år, opplag, sider
2017. , 49 s.
Serie
Thesis: Master of Science in Mechanichal Engineering
Emneord [en]
Comets: general, Comets: individual: 67P, plasmas, methods: observational, space vehicles: instruments
HSV kategori
Identifikatorer
URN: urn:nbn:se:ltu:diva-65531OAI: oai:DiVA.org:ltu-65531DiVA: diva2:1139588
Fag / kurs
Student thesis, at least 30 credits
Utdanningsprogram
Space Engineering, master's level (120 credits)
Presentation
2017-09-06, Room A, LTU Kiruna, Rymdkampus 1, Kiruna, 14:00 (engelsk)
Veileder
Examiner
Tilgjengelig fra: 2017-09-08 Laget: 2017-09-08 Sist oppdatert: 2017-09-08bibliografisk kontrollert

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