Session ST2.9

[Programme]

ST2.9 | Inner-magnetosphere Interactions and Coupling

Inner-magnetosphere Interactions and Coupling

Co-organized by PS4

Convener: Dedong WangECSECS | Co-conveners: Chao YueECSECS, Ravindra DesaiECSECS, Ondrej Santolik, Hayley AllisonECSECS

Orals

| Mon, 28 Apr, 08:30–10:10 (CEST)

Room 1.14

Posters on site

| Attendance Mon, 28 Apr, 10:45–12:30 (CEST) | Display Mon, 28 Apr, 08:30–12:30

Hall X4

Posters virtual

| Attendance Thu, 01 May, 14:00–15:45 (CEST) | Display Thu, 01 May, 08:30–18:00

vPoster spot 3

The Earth's inner magnetosphere contains different charged particle populations, such as the Van Allen radiation belts, ring current particles, and plasmaspheric particles. Their energy range varies from eV to several MeV, and the interplay among the charged particles provide feedback mechanisms which couple all those populations together. Ring current particles can generate various waves, for example, EMIC waves and chorus waves, which play important roles in the dynamic evolution of the radiation belts through wave-particle interactions. Ring current electrons can be accelerated to relativistic radiation belt electrons. The plasmaspheric medium can also affect these processes. In addition, precipitation of ring current and radiation belt particles will influence the ionosphere, while up-flows of ionospheric particles can affect dynamics in the inner magnetosphere. Understanding these coupling processes is crucial for fundamental understanding and for accurate space weather forecasting.

While the dynamics of outer planets’ magnetospheres are driven by a unique combination of internal coupling processes, these systems have a number of fascinating similarities which make comparative studies particularly interesting. We invite a broad range of theoretical, modelling, and observational studies focusing on the dynamics of the inner magnetosphere of the Earth and outer planets, including the coupling of the inner magnetosphere and ionosphere and coupling between the solar wind disturbances and various magnetospheric processes. Contributions from all relevant fields, including theoretical studies, numerical modelling, observations from satellite and ground-based missions are welcome as well as new mission concepts. In particular, we encourage presentations using data from MMS, THEMIS, Van Allen Probes, Arase (ERG), Cluster, CubeSat missions, Juno, SuperDARN, magnetometer, optical imagers, IS-radars and ground-based VLF measurements. We also invite contributions from new mission concepts.

Orals: Mon, 28 Apr, 08:30–10:15 | Room 1.14

Chairpersons: Dedong Wang, Chao Yue, Ravindra Desai

Posters on site: Mon, 28 Apr, 10:45–12:30 | Hall X4

Display time: Mon, 28 Apr, 08:30–12:30

Posters virtual: Thu, 1 May, 14:00–15:45 | vPoster spot 3

Display time: Thu, 1 May, 08:30–18:00

Chairpersons: Guram Kervalishvili, Emilia Kilpua, Dalia Buresova

EGU25-4720 | ECS | Posters virtual | VPS27

Influence of solar wind driving and geomagnetic activity on the variability of sub-relativistic electrons in the inner magnetosphere

Evangelia Christodoulou, Christos Katsavrias, Panayotis Kordakis, and Ioannis Daglis
Thu, 01 May, 14:00–15:45 (CEST) vPoster spot 3 | vP3.18

Motivated by the need for more accurate radiation environment modelling, this study focuses on identifying and analyzing the drivers behind the sub-relativistic electron flux variations in the inner magnetosphere. We utilize electron flux data between 1 and 500 keV from the Hope and MagEIS instruments on board the RBSP satellites, as well as from the FEEPS instruments on board the MMS spacecrafts, along with solar wind parameters and geomagnetic indices obtained from the OmniWeb2 and SuperMag data services. We calculate the correlation coefficients between these parameters and electron flux. Our analysis shows that substorm activity is a crucial driver of the source electron population (10 - 100 keV), while also showing that seed electrons (100 - 400 keV) are not purely driven by substorm events, but also from enhanced convection/inward diffusion. By introducing time lags, we observed a delayed response of electron flux to changes in geospace conditions, and we identified specific time lag periods where the correlation is maximum. This work contributes to our broader understanding of the outer belt sub-relativistic electron dynamics, and forms the basis for future research.

How to cite: Christodoulou, E., Katsavrias, C., Kordakis, P., and Daglis, I.: Influence of solar wind driving and geomagnetic activity on the variability of sub-relativistic electrons in the inner magnetosphere, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-4720, https://doi.org/10.5194/egusphere-egu25-4720, 2025.