Yet another caveat to using the Dessler‐Parker‐Sckopke relation

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/95475/1/jgra16950.pd

Preface to the Special Collection: Recollections in Space Physics

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/152793/1/jgra55351.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/152793/2/jgra55351_am.pd

Continued convection and the initial recovery of Dst

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/94856/1/grl16086.pd

Ring current simulations of the 90 intense storms during solar cycle 23

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/94717/1/jgra19539.pd

Outflow in global magnetohydrodynamics as a function of a passive inner boundary source

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/106972/1/jgra50946.pd

Photoelectrons in the quiet polar wind

This study presents a newly coupled model capable of treating the superthermal electron population in the global polar wind solution. The model combines the hydrodynamic Polar Wind Outflow Model (PWOM) with the kinetic SuperThermal Electron Transport (STET) code. The resulting PWOM‐STET coupled model is described and then used to investigate the role of photoelectrons in the polar wind. We present polar wind results along single stationary field lines under dayside and nightside conditions, as well as the global solution reconstructed from nearly 1000 moving field lines. The model results show significant day‐night asymmetries in the polar wind solution owing to the higher ionization and photoelectron fluxes on the dayside compared to the nightside. Field line motion is found to modify this dependence and create global structure by transporting field lines through different conditions of illumination and through the localized effects of Joule heating.Key PointsStudy presents a newly coupled model capable of treating the superthermal electron population in the global polar wind solutionSingle stationary field line solutions under sunlit and dark conditions are presented as is the global solution from ∼1000 moving linesField line motion creates global structure by transporting field lines through different conditions of illumination and Joule heatingPeer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/137691/1/jgra53574.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/137691/2/jgra53574_am.pd

Comment on “Nonlinear response of the polar ionosphere to large values of the interplanetary electric field” by C. T. Russell et al.

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/95504/1/jgra16638.pd

The ionospheric source of magnetospheric plasma is not a black box input for global models

Including ionospheric outflow in global magnetohydrodynamic models of near‐Earth outer space has become an important step toward understanding the role of this plasma source in the magnetosphere. Of the existing approaches, however, few tie the outflowing particle fluxes to magnetospheric conditions in a self‐consistent manner. Doing so opens the magnetosphere‐ionosphere system to nonlinear mass‐energy feedback loops, profoundly changing the behavior of the magnetosphere‐ionosphere system. Based on these new results, it is time for the community eschew treating ionospheric outflow as a simple black box source of magnetospheric plasma.Key PointsIonospheric outflow plays a critical role in the magnetosphereThe magnetosphere affects outflowModelers must account for this two‐way relationshipPeer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/133592/1/jgra52677_am.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/133592/2/jgra52677.pd

Statistical analysis of storm-time near-Earth current systems

Currents from the Hot Electron and Ion Drift Integrator (HEIDI) inner magnetospheric model results for all of the 90 intense storms (disturbance storm-time (Dst) minimum \u3c −100 nT) from solar cycle 23 (1996–2005) are calculated, presented, and analyzed. We have categorized these currents into the various systems that exist in near-Earth space, specifically the eastward and westward symmetric ring current, the partial ring current, the banana current, and the tail current. The current results from each run set are combined by a normalized superposed epoch analysis technique that scales the timeline of each phase of each storm before summing the results. It is found that there is a systematic ordering to the current systems, with the asymmetric current systems peaking during storm main phase (tail current rising first, then the banana current, followed by the partial ring current) and the symmetric current systems peaking during the early recovery phase (westward and eastward symmetric ring current having simultaneous maxima). The median and mean peak amplitudes for the current systems ranged from 1 to 3 MA, depending on the setup configuration used in HEIDI, except for the eastward symmetric ring current, for which the mean never exceeded 0.3 MA for any HEIDI setup. The self-consistent electric field description in HEIDI yielded larger tail and banana currents than the Volland–Stern electric field, while the partial and symmetric ring currents had similar peak values between the two applied electric field models

Can ring current stabilize magnetotail during steady magnetospheric convection?

The present study investigates the role of the ring current in stabilizing the magnetotail during steady magnetospheric convection (SMC) events. We develop a method for estimation of the symmetric ring current intensity from the single spacecraft magnetic field observations. The method is applied to a large number of SMC events identified using three different automatic procedures adopted from the literature. It is found that the symmetric ring current can be weak or strong depending on a particular event. We find a significant fraction of events that have a rather weak symmetric ring current in spite of the strong solar wind driving during the event. These findings imply that the symmetric ring current plays no role in the magnetotail stabilization.Key PointsAnalysis of AE‐based criteria for SMC selectionNew method for ring current intensity estimationRing current plays no role in magnetotail stabilizationPeer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/134802/1/jgra52295_am.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134802/2/jgra52295.pd