Energetic ion injection and formation of the storm-time symmetric ring current

Xie, Luhua; Pu, Z. Y.; Zhou, X.‐Z.; Fu, S. Y.; Zong, Q.; Hong, Mo

doi:10.5194/angeo-24-3547-2006

Cited by 10 publications

(8 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is noted that only a small number of solar wind ions enter the ring current region directly from the polar cusp (Peroomian and Ashour-Abdalla, 1996). Ring current particles are, in this scenario, injected Earthward from the magnetotail by the convection electric field driven by the southward IMF (Wygant et al, 1998, Hori et al, 2005, Xie et al, 2006, and/or the induced electric field associated with sub-storm dipolarization of the geomagnetic field (Delcourt, 2002).…”

Section: Introductionmentioning

confidence: 97%

“…The most energetic ions injected from the inner plasma sheet by the convection electric field are transported along open drift paths from the magnetotail to the magnetopause (Xie et al, 2006), where they only form a partial ring current (Le et al, 2004). The source and the paths followed by these ring current ions have posed a puzzle for a long time.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The causal sequence investigation of the ring current ion-flux increasing and the magnetotail ion injection during a major storm

McKenna‐Lawlor

Cao

et al. 2015

Sci. China Earth Sci.

View full text Add to dashboard Cite

Comprehensive records are available in ENA data of ring current activity recorded by the NUADU instrument aboard TC-2 on 15 May, 2005 during a major magnetic storm (which incorporated a series of substorms). Ion fluxes at 4-min temporal resolution derived from ENA data in the energy ranges 50-81 and 81-158 keV are compared with in situ particle fluxes measured by the LANL-SOPA instruments aboard LANL-01, LANL-02, LANL-97, and LANL-84 (a series of geostationary satellites that encircle the equatorial plane at ~6.6 R E ). Also, magnetic fields measured simultaneously by the magetometers aboard GOES-10 and GOES-12 (which are also geostationary satellites) are compared with the particle data. It is demonstrated that ion fluxes in the ring current were enhanced during geomagnetic field tailward stretching in the growth phases of substorms rather than after Earthward directed dipolarization events. This observation, which challenges the existing concept that ring current particles are injected Earthward from the magnetotail following dipolarization events, requires further investigation using a large number of magnetic storm events. . 2016. The causal sequence investigation of the ring current ion-flux increasing and the magnetotail ion injection during a major storm.

show abstract

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

The causal sequence investigation of the ring current ion-flux increasing and the magnetotail ion injection during a major storm

McKenna‐Lawlor

Cao

et al. 2015

Sci. China Earth Sci.

View full text Add to dashboard Cite

show abstract

“…These heavy ions influence the plasma pressure and, therefore, affect the local dynamics. Additionally, as shown by a model of Xie et al 2006 (threedimensional test particle trajectory calculations), O + ions are more easily trapped on closed drift trajectories than protons. Therefore, these O + ions help in maintaining the ring current bulk population.…”

Section: Sawtooth Eventsmentioning

confidence: 99%

Circulation of Heavy Ions and Their Dynamical Effects in the Magnetosphere: Recent Observations and Models

et al. 2014

View full text Add to dashboard Cite

Knowledge of the ion composition in the near-Earth's magnetosphere and plasma sheet is essential for the understanding of magnetospheric processes and instabilities. The presence of heavy ions of ionospheric origin in the magnetosphere, in particular oxygen (O + ), influences the plasma sheet bulk properties, current sheet (CS) thickness and its structure. It affects reconnection rates and the formation of Kelvin-Helmholtz instabilities. This has profound consequences for the global magnetospheric dynamics, including geomagnetic storms and substorm-like events. The formation and demise of the ring current and the radiation belts are also dependent on the presence of heavy ions. In this review we cover recent advances in observations and models of the circulation of heavy ions in the magne- tosphere, considering sources, transport, acceleration, bulk properties, and the influence on the magnetospheric dynamics. We identify important open questions and promising avenues for future research.

show abstract

“…In some senses we have a very good understanding of the ring current. It is believed that the ring current mainly consists of 10∼200 keV ions (mainly H + , O + , and He + ) and electrons that drift around the Earth at radial distances of about 2∼7 Earth radii (R e ) [1] , with most energy carried by westward-drifting ions. This circulation, which is due to a combination of curvature and gradient drift, is eastward for electrons and westward for ions.…”

Section: Introductionmentioning

confidence: 99%

Evolvement of the Ring Current During a Magnetic Storm: TC‐2 Neutral Atom Imager Observations

Chen

Shen

et al. 2010

Chinese J of Geophysics

View full text Add to dashboard Cite

A series of ENA images were obtained by the NUADU instrument aboard TC-2 during a strong, long duration magnetic storm that occurred in November 2004. This paper follows the evolution of the ring current during this magnetic storm. It is shown that the southward IMF Bz component plays a key role in facilitating ion injection from the magnetotail into the inner magnetosphere with consequent enhancement of the ring current. Ion injection stopped soon after the IMF turned from southward to northward. Also during ion injection episodes, the ion drift paths opened and ring current ions were lost at the noon to dusk magnetopause soon after they were injected at the dusk side region. As a result, the ring current intensified after the occurrence of an open-to-closed transformation of the ion drift paths, rather than at the stage when ion injection was strong. In the main phase of the storm, ion injection took place between local times about 17:00∼22:00, leading to an extremely asymmetric ring current. In contrast in the recovery phase of the storm, the ion injection region reached the post-midnight sector. We attributed this phenomenon to a significant positive IMF By component. A symmetrical ring current was formed after the drift paths changed back to a closed configuration due to a decrease in tail convection. When the storm entered its late recovery phase, the ring current faded away while the Dst still indicated a strong magnetic disturbance. This suggested an important contribution to Dst from the cross tail current.

show abstract

Energetic ion injection and formation of the storm-time symmetric ring current

Cited by 10 publications

References 25 publications

The causal sequence investigation of the ring current ion-flux increasing and the magnetotail ion injection during a major storm

The causal sequence investigation of the ring current ion-flux increasing and the magnetotail ion injection during a major storm

Circulation of Heavy Ions and Their Dynamical Effects in the Magnetosphere: Recent Observations and Models

Evolvement of the Ring Current During a Magnetic Storm: TC‐2 Neutral Atom Imager Observations

Contact Info

Product

Resources

About