Search Publications
Timing of changes in the solar wind energy input in relation to ionospheric response
Janhunen, P.; McComas, D. J.; Palmroth, M. +3 more
We investigate four consecutive substorms using observations and global MHD simulation code GUMICS-4. The solar wind energy input is estimated by the epsilon parameter and evaluated from the simulation by direct integration of the energy transfer through the magnetopause. The ionospheric dissipation is estimated using the AE index and also evaluat…
Multisatellite low-altitude observations of a magnetopause merging burst
Wing, Simon; Liou, Kan; Newell, Patrick T. +3 more
A fortuitous multisatellite observation of a dayside merging event driven by a sharp southward interplanetary magnetic field (IMF) turning illuminates several ionospheric particle and auroral reconnection signatures. Shortly after the southward IMF turning, as propagated from ACE, DMSP F13 observed a region equatorward of the cusp emptied of magne…
Ring current formation influenced by solar wind substorm conditions
Cash, M. D.; Winglee, R. M.; Harnett, E. M.
Single-particle tracking with time-dependent global magnetic and electric fields is used to investigate the generation of the ring current from ionospheric outflows during an internally driven substorm. We show that the energization of the ions is not correlated with the time that the ions leave the ionosphere; instead energization is correlated w…
Acceleration of electrons in Titan's ionosphere
Khodachenko, M. L.; Rucker, H. O.; Panchenko, M. +2 more
A consideration of the acceleration mechanism which supplies the fast electrons to the source of Saturnian kilometric radiation (SKR) and an interpretation of the recently reported observational indications of the influence of Titan on the SKR are presented. The proposed mechanism operates by the effect of the different magnetization of the electr…
Quasistatic electric field structures and field-aligned currents in the polar cusp region
Jacobsen, K. S.; Moen, J. I.; Pedersen, A.
Cluster data have been examined for quasi-stationary electric field structures and field-aligned currents (FACs) in the vicinity of the dayside cusp region. We have related the measurements to the Region 1/Region 2 (R1/R2) current system and the cusp current system. It has been theoretically proposed that the dayside R1 current may be located on o…
Using a global magnetohydrodynamic model to study the start of the substorm recovery phase
Baker, D. N.; Wiltberger, M.; Farr, N. L.
Magnetospheric substorms are a key manifestation of the transfer of energy from the solar wind to the Earth. Substorms consist of a loading of energy from the solar wind via magnetic reconnection and then a rapid release of that energy. One of the results of this energy release is the intense brightening of the aurora observed in the Earth's high-…