Influence of the solar wind dynamic pressure on the decay and injection of the ring current

Wang, Chuanbing; Chao, J. K.; Lin, Charles

doi:10.1029/2003ja009851

Cited by 102 publications

(133 citation statements)

References 55 publications

(143 reference statements)

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“…From these studies, we can deduce the relationship between P d and D st . On the other hand, some studies have argued that the relationship between P d and D st is due to the dependence of transpolar potential saturation on P d (Xie et al, 2008;Weigel, 2010). However, these studies have not provided an explanation for the anti-correlation between the long-term variation of P d and the non-storm component of D st demonstrated in the present study.…”

Section: Discussioncontrasting

confidence: 53%

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Non-storm irregular variation of the Dst index

Nakano

Higuchi

2012

Ann. Geophys.

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Abstract. The D st index has a long-term variation that is not associated with magnetic storms. We estimated the longterm non-storm component of the D st variation by removing the short-term variation related to magnetic storms. The results indicate that the variation of the non-storm component includes not only a seasonal variation but also an irregular variation. The irregular long-term variation is likely to be due to an anti-correlation with the long-term variation of solar-wind activity. In particular, a clear anti-correlation is observed between the non-storm component of D st and the long-term variation of the solar-wind dynamic pressure. This means that in the long term, the D st index tends to increase when the solar-wind dynamic pressure decreases. We interpret this anti-correlation as an indication that the long-term non-storm variation of D st is influenced by the tail current variation. The long-term variation of the solar-wind dynamic pressure controls the plasma sheet thermal pressure, and the change of the plasma sheet thermal pressure would cause the non-storm tail current variation, resulting in the non-storm variation of D st .

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Section: Discussioncontrasting

confidence: 53%

“…O'Brien and McPherron, 2000;Wang et al, 2003;Xie et al, 2008). For example, according to Xie et al (2008), the parameters b and c in Eq.…”

Section: Introductionmentioning

confidence: 99%

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Non-storm irregular variation of the Dst index

Nakano

Higuchi

2012

Ann. Geophys.

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“…Also, some authors investigated its effect on the geosynchronous magnetic field [Wing et al, 2002;Lee and Lyons, 2004]. However, the effect of the solar wind dynamic pressure on the development of the storm time ring current has received almost no attention until the recent work by Wang et al [2003]. Wang et al [2003] used solar wind and Dst index from the OMNI database to empirically investigate the influence of the solar wind dynamic pressure on the injection and decay of the ring current.…”

Section: Introductionmentioning

confidence: 99%

Effect of solar wind pressure enhancements on storm time ring current asymmetry

et al. 2005

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[1] The effect of solar wind pressure enhancements on storm time ring current asymmetry is investigated by examining the asymmetric variations in the north-south (H) and east-west (D) components of the geomagnetic field during four magnetic storms. For two strong storms, on 25 September 1998 and 29 May 2003, pressure enhancements occurred during the main phase with strong and steadily southward IMF B z . It is found that the pressure enhancements significantly increase the asymmetry of the already strong and asymmetric ring current under these conditions. For the moderate magnetic storm on 10 January 1997, a pressure enhancement occurred during the early recovery phase when IMF B z was turning northward while it was still southward. Our result shows that the pressure enhancement also slightly enhanced the asymmetry of the slightly asymmetric ring current that existed during the early recovery phase. On 6 November 2000, a pressure enhancement occurred during the late recovery phase when the IMF B z was strongly northward. For this case, the pressure enhancement did not increase the asymmetry of the already symmetric ring current. The above results of ring current asymmetry increases can be explained by considering the local energization of the preexisting ring current particles by the azimuthal electric field induced by the pressure enhancement. Our results show that the effect of pressure enhancements on the ring current depends strongly on the asymmetry state of the ring current at the times of the onsets of pressure enhancements, which is in turn determined by the IMF B z preconditioning. In addition, the size and relative strength of a pressure enhancement also play important roles in affecting the ground asymmetric H perturbation.Citation: Shi, Y., E. Zesta, L. R. Lyons, A. Boudouridis, K. Yumoto, and K. Kitamura (2005), Effect of solar wind pressure enhancements on storm time ring current asymmetry,

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“…Among these studies, some considered a constant recovery time (e.g., Burton et al 1975), others depended on the convective electric field E y (O'Brien & McPherron 2000) or also on the dynamic pressure (Wang et al 2003).…”

Section: About the Recovery Phasementioning

confidence: 99%

Geomagnetic response to solar and interplanetary disturbances

Sáiz

Cerrato

Cid

et al. 2013

J. Space Weather Space Clim.

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The space weather discipline involves different physical scenarios, which are characterised by very different physical conditions, ranging from the Sun to the terrestrial magnetosphere and ionosphere. Thanks to the great modelling effort made during the last years, a few Sun-to-ionosphere/thermosphere physics-based numerical codes have been developed. However, the success of the prediction is still far from achieving the desirable results and much more progress is needed. Some aspects involved in this progress concern both the technical progress (developing and validating tools to forecast, selecting the optimal parameters as inputs for the tools, improving accuracy in prediction with short lead time, etc.) and the scientific development, i.e., deeper understanding of the energy transfer process from the solar wind to the coupled magnetosphere-ionosphere-thermosphere system. The purpose of this paper is to collect the most relevant results related to these topics obtained during the COST Action ES0803. In an end-to-end forecasting scheme that uses an artificial neural network, we show that the forecasting results improve when gathering certain parameters, such as X-ray solar flares, Type II and/or Type IV radio emission and solar energetic particles enhancements as inputs for the algorithm. Regarding the solar wind-magnetosphere-ionosphere interaction topic, the geomagnetic responses at high and low latitudes are considered separately. At low latitudes, we present new insights into temporal evolution of the ring current, as seen by Burton's equation, in both main and recovery phases of the storm. At high latitudes, the PCC index appears as an achievement in modelling the coupling between the upper atmosphere and the solar wind, with a great potential for forecasting purposes. We also address the important role of small-scale field-aligned currents in Joule heating of the ionosphere even under non-disturbed conditions. Our scientific results in the framework of the COST Action ES0803 cover the topics from the short-term solar-activity evolution, i.e., space weather, to the long-term evolution of relevant solar/heliospheric/magnetospheric parameters, i.e., space climate. On the timescales of the Hale and Gleissberg cycles (22-and 88-year cycle respectively) we can highlight that the trend of solar, heliospheric and geomagnetic parameters shows the solar origin of the widely discussed increase in geomagnetic activity in the last century.

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Influence of the solar wind dynamic pressure on the decay and injection of the ring current

Cited by 102 publications

References 55 publications

Non-storm irregular variation of the <I>D</I><sub>st</sub> index

Non-storm irregular variation of the <I>D</I><sub>st</sub> index

Effect of solar wind pressure enhancements on storm time ring current asymmetry

Geomagnetic response to solar and interplanetary disturbances

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Influence of the solar wind dynamic pressure on the decay and injection of the ring current

Cited by 102 publications

References 55 publications

Non-storm irregular variation of the &lt;I&gt;D&lt;/I&gt;&lt;sub&gt;st&lt;/sub&gt; index

Non-storm irregular variation of the &lt;I&gt;D&lt;/I&gt;&lt;sub&gt;st&lt;/sub&gt; index

Effect of solar wind pressure enhancements on storm time ring current asymmetry

Geomagnetic response to solar and interplanetary disturbances

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Non-storm irregular variation of the <I>D</I><sub>st</sub> index

Non-storm irregular variation of the <I>D</I><sub>st</sub> index