Case studies of solar minimum exospheric neutral density at 10 Re subsolar location using XMM-Newton X-ray observation and a global MHD model - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2020

Case studies of solar minimum exospheric neutral density at 10 Re subsolar location using XMM-Newton X-ray observation and a global MHD model

Résumé

Soft X-rays can be emitted when highly charged solar wind ions like O7+ and O8+ steal electrons from neutral hydrogens. This process is called Solar Wind Charge Exchange (SWCX). The Earth's magnetosheath and cusps are expected to emit strong SWCX emission because solar wind ions and/or exospheric neutrals are densely populated in these regions. A series of heliophysics missions (e.g. CuPID, LEXI, and SMILE) are scheduled to visualize the Earth's dayside magnetospheric system in soft X-rays and thus to understand the solar wind - magnetosphere interaction. Recently, exospheric density near the subsolar magnetopause has become an important parameter to predict SWCX signals for the scheduled missions. Higher neutral density creates strong SWCX signals, which is preferable for the soft X-ray imagers. This presentation estimates exospheric neutral density at 10RE subsolar location during solar minimum, using XMM-Newton X-ray observations and the OpenGGCM global MHD model. The XMM-Newton astrophysics orbiting observatory may observe a foreground near-Earth SWCX signal when its line of sight bisects the magnetosheath. We select two XMM-Newton observations during solar minimum and extract the near-Earth SWCX signal after careful removal of all other background components from the raw XMM-Newton data. Then, we simulate the OpenGGCM global MHD model for the two events. After validating our model results with the THEMIS in-situ magnetosheath observations, we estimate and subtract the plasma contribution to the near-Earth SWCX signals in order to obtain the exospheric neutral density. The estimated exospheric densities during solar minimum are higher than the solar maximum neutral density reported in Connor & Carter [2019].
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Dates et versions

hal-03322877 , version 1 (19-08-2021)

Identifiants

Citer

Jaewoong Jung, Hyunju K. Connor, Jenny A. Carter, Claudio Pagani, Dimitra Koutroumpa. Case studies of solar minimum exospheric neutral density at 10 Re subsolar location using XMM-Newton X-ray observation and a global MHD model. American Geophysical Union, Fall Meeting 2020, Dec 2020, Online, Unknown Region. pp.abstract #SM029-03. ⟨hal-03322877⟩
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