TY  - JOUR
A1  - Haas, Bernhard
A1  - Shprits, Yuri Y.
A1  - Allison, Hayley
A1  - Wutzig, Michael
A1  - Wang, Dedong
T1  - Which parameter controls ring current electron dynamics
JF  - Frontiers in astronomy and space sciences
N2  - Predicting the electron population of Earth's ring current during geomagnetic storms still remains a challenging task. 
In this work, we investigate the sensitivity of 10 keV ring current electrons to different driving processes, parameterised by the Kp index, during several moderate and intense storms. 
Results are validated against measurements from the Van Allen Probes satellites. Perturbing the Kp index allows us to identify the most dominant processes for moderate and intense storms respectively. 
We find that during moderate storms (Kp < 6) the drift velocities mostly control the behaviour of low energy electrons, while loss from wave-particle interactions is the most critical parameter for quantifying the evolution of intense storms (Kp > 6). Perturbations of the Kp index used to drive the boundary conditions at GEO and set the plasmapause location only show a minimal effect on simulation results over a limited L range. 
It is further shown that the flux at L & SIM; 3 is more sensitive to changes in the Kp index compared to higher L shells, making it a good proxy for validating the source-loss balance of a ring current model.
KW  - ring current
KW  - magnetosphere
KW  - electron lifetimes
KW  - electrons
KW  - van allen probes (RBSP)
KW  - ring current model
KW  - verb
Y1  - 2022
U6  - https://doi.org/10.3389/fspas.2022.911002
SN  - 2296-987X
VL  - 9
PB  - Frontiers Media
CY  - Lausanne
ER  - 
TY  - JOUR
A1  - Usanova, Maria E.
A1  - Shprits, Yuri Y.
T1  - Inner magnetosphere coupling
BT  - Recent advances
JF  - Journal of geophysical research : Space physics
N2  - The dynamics of the inner magnetosphere is strongly governed by the interactions between different plasma populations that are coupled through large-scale electric and magnetic fields, currents, and wave-particle interactions. Inner magnetospheric plasma undergoes self-consistent interactions with global electric and magnetic fields. Waves excited in the inner magnetosphere from unstable particle distributions can provide energy exchange between different particle populations in the inner magnetosphere and affect the ring current and radiation belt dynamics. The ionosphere serves as an energy sink and feeds the magnetosphere back through the cold plasma outflow. The precipitating inner magnetospheric particles influence the ionosphere and upper atmospheric chemistry and affect climate. Satellite measurements and theoretical studies have advanced our understanding of the dynamics of various plasma populations in the inner magnetosphere. However, our knowledge of the coupling processes among the plasmasphere, ring current, radiation belts, global magnetic and electric fields, and plasma waves generated within these systems is still incomplete. This special issue incorporates extended papers presented at the Inner Magnetosphere Coupling III conference held 23–27 March 2015 in Los Angeles, California, USA, and includes modeling and observational contributions addressing interactions within different plasma populations in the inner magnetosphere (plasmasphere, ring current, and radiation belts), coupling between fields and plasma populations, as well as effects of the inner magnetosphere on the ionosphere and atmosphere.
KW  - inner magnetosphere
KW  - ring current
KW  - radiation belts
KW  - magnetosphere
KW  - ionosphere interactions
KW  - plasmasphere
KW  - solar wind
Y1  - 2016
U6  - https://doi.org/10.1002/2016JA023614
SN  - 2169-9380
SN  - 2169-9402
VL  - 122
IS  - 1
SP  - 102
EP  - 104
PB  - American Geophysical Union
CY  - Washington
ER  -