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UID:168@atst.osups.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20260922T133000
DTEND;TZID=Europe/Paris:20260922T163000
DTSTAMP:20260914T212947Z
URL:https://atst.osups.universite-paris-saclay.fr/calendrier/soutenance-th
 ese-qiuyu-xu/
SUMMARY:Soutenance de thèse de Qiuyu Xu
DESCRIPTION:J'ai le plaisir de vous inviter à ma soutenance de thèse qui 
 aura lieu le mardi 22 septembre 2026 à 13h30.\nElle se tiendra à Jussieu
 \, dans la Salle de Conférences 105\, Tour 44-54\, 1e étage.\nJe vous pr
 ésenterai mes travaux de thèse intitulée "Emissions X par échange de c
 harge du vent solaire dans l’environnement terrestre : Simulations numé
 riques en soutien à la mission magnétosphérique SMILE" réalisés sous 
 la direction de Dimitra Koutroumpa et Ronan Modolo.\nLa présentation sera
  en anglais et un lien est disponible pour ceux qui souhaitent la suivre 
 à distance. Vous trouverez ci-dessous le résumé de la thèse ainsi que 
 la composition du jury.\n\n\n\nI am pleased to invite you to my thesis def
 ence which will take place on Tuesday\, 22 September 2026\, at 13:30.\nIt 
 will be held in Jussieu\, Conference Room 105\, Tower 44-54\, 1st floor.\n
 I will present my thesis entitled ‘Solar wind charge exchange X-ray emis
 sions in the near-Earth environment: Numerical simulations in support of t
 he SMILE magnetospheric mission’ supervised by Dimitra Koutroumpa and Ro
 nan Modolo.\nThe presentation will be in English\, and a link is available
  for those who are unable to attend in person.\nBelow you will find a summ
 ary of the thesis and the composition of the evaluation committee.\n\nEval
 uation committee :\n\n 	Rapporteurs: Minna Palmroth and Vincent Maget\n 	E
 xaminateurs: Sébastien Galtier\, Caitriona Jackman\, Benoit Lavraud\n\nAb
 stract:\nThe interaction between the solar wind and the terrestrial magnet
 ic field forms a dynamic magnetosphere whose boundaries respond continuous
 ly to variations in the upstream plasma and interplanetary magnetic field.
  Soft X-ray emission produced by solar wind charge exchange (SWCX) offers 
 a technique to remotely detect this interaction globally. In preparation f
 or the SMILE mission\, this thesis develops numerical methods to model the
  SWCX emissions and to derive the magnetopause location from X-ray images.
 \n\nAt first\, we present the LATMOS Test Particle (LaTeP) model which tra
 ces multiply charged solar wind ions through electromagnetic fields input 
 by other simulations and calculates the corresponding SWCX emission. The m
 odel resolves species-dependent ion transport and separates solar-wind-ori
 gin ions from magnetospheric plasma.\nThen we develop a dynamic version\, 
 D-LaTeP\, to use time-sequential input electromagnetic fields to simulate 
 the temporal evolution of the SWCX near the magnetosphere. We validate D-L
 aTeP using two real-time solar wind cases.\nWe then apply D-LaTeP to a cor
 onal mass ejection event and compare the simulation results with XMM-Newto
 n observations. These simulations show that the model reproduces the globa
 l motion of the dayside boundaries and the main temporal evolution of the 
 X-ray intensity observed by XMM-Newton. They also indicate that solar wind
  heavy ions can enter the magnetosphere under strong upstream conditions a
 nd produce emission inside magnetosphere.\nFinally\, we propose a Hough-li
 ke method to retrieve the magnetopause from synthetic SMILE images by fitt
 ing the projected tangent curves of analytical magnetopause surfaces. The 
 results demonstrate the potential of soft X-ray imaging for global magneto
 spheric monitoring\, while also showing that photon statistics\, viewing g
 eometry\, exospheric density\, and inner-magnetospheric emission need to b
 e carefully considered in the interpretation of such observations.\n\n(Tra
 nsmis par Qiuyu Xu)
CATEGORIES:Séminaires et soutenances de thèse/HDR
LOCATION:Campus Pierre et Marie Curie (Jussieu)\, Paris\, Place Jussieu\, P
 aris\, 75005\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Place Jussieu\, Paris\, 750
 05\, France;X-APPLE-RADIUS=100;X-TITLE=Campus Pierre et Marie Curie (Jussi
 eu)\, Paris:geo:0,0
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