Relationship between sawtooth events and magnetic storms

Cai, X.; Zhang, J.-C.; Clauer, C. R.; Liemohn, Michael W.

doi:10.1029/2010ja016310

Cited by 15 publications

(66 citation statements)

References 40 publications

(57 reference statements)

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“…They found that storms tend to be stronger in August only if the IMF is antiparallel (away) with the Earth's. As most of sawtooth events were accompanied with intense storms [ Cai et al , ], our results agree with their conclusions. However, Oh and Yi [] only examined two solar minimums during which the background solar magnetic field could be considered as a dipole.…”

Section: Discussionsupporting

confidence: 93%

Magnetospheric sawtooth events during the solar cycle 23

Cai

Clauer

2013

JGR Space Physics

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[1] The Earth's magnetosphere and ionosphere have a variety of responses to different solar activities. As a result, there are several types of magnetosphere response modes; one of which is termed sawtooth injection events. Currently, it is still unclear whether sawtooth events occurrence has a solar cycle dependence. Partially, this is due to a lack of an event list which covers a full solar cycle. In this research, we have extended our original event list to cover the solar cycle 23, which now includes 126 events from 1996 to 2007. Sawtooth events have been grouped into three categories based on their solar wind drivers: interplanetary coronal mass ejections, stream interaction regions, and others. Then we examine in detail whether sawtooth events occurrence has dependencies on solar cycle and season. We also test a hypothesis that sawtooth events occurrence is related to a threshold of total eroded magnetic flux at the magnetopause regardless of solar wind structures. This paper suggests understanding sawtooth events and other convection modes from solar wind magnetic flux or energy aspect rather than from structure aspect, which is an important idea to understand the complicated magnetosphere dynamics.

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Section: Discussionsupporting

confidence: 93%

Magnetospheric sawtooth events during the solar cycle 23

Cai

Clauer

2013

JGR Space Physics

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“…Observations show that ∼94 % of sawtooth events occur during geomagnetic storm times (Cai et al 2011). It is also known that the O + concentration inside the magnetosphere is highly correlated with geomagnetic storms.…”

Section: Sawtooth Eventsmentioning

confidence: 99%

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

et al. 2014

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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.

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“…The study by Cai et al . [] identified four STEs during this storm. Their criteria for designating events as STEs demanded repeated and nearly simultaneous observations of increased 50–450 keV proton fluxes by LANL satellites within ±3 h of local midnight and noon.…”

Section: Introductionmentioning

confidence: 95%

“…One storm time response, in the form of the SYM‐H index [ Iyemori , ], is shown in the bottom panel. The four vertical red lines superposed on the SYM‐H trace mark the times of the four identified STE onsets [ Cai et al ., ]. An examination of these data identifies four empirical results.…”

Section: Observationsmentioning

confidence: 99%

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Sawtooth‐substorm connections: A closer look

Noah

Burke

2013

JGR Space Physics

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[1] This paper seeks to improve understanding of sawtooth events (STEs) that occur during the main phases of geomagnetic storms. We consider the dynamics of diverse space environments encountered during a magnetic storm on 24 March 2002 when four STEs were identified in energetic particle fluxes measured by Synchronous Orbit Particle Analyzers on Los Alamos National Laboratory satellites. Over the reported interval, 28 substorms were identified in magnetometer traces obtained via the SuperMAG international collaboration. Magnetic inclination variations sampled by the Geostationary Operational Environment Satellites 8 and 10 on the nightside indicate that STEs coincided with substorms marked by strong and prolonged dipolarizations. Significantly, the four STEs were accompanied by partial recoveries of the SYM-H index. Two SuperMAG substorms were marked by weak dipolarizations and energetic particle flux increases. The remaining 22 substorms showed no such signatures near 6.6 R E . We regard the latter SuperMAG events as indicating intensifications of the DP 2 current system driven by episodically enhanced reconnection at the distant X line. Presented data are shown to be consistent with the conjecture of Huang et al. (2009)

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Relationship between sawtooth events and magnetic storms

Cited by 15 publications

References 40 publications

Magnetospheric sawtooth events during the solar cycle 23

Magnetospheric sawtooth events during the solar cycle 23

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

Sawtooth‐substorm connections: A closer look

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