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Effect of solar wind plasma parameters on space weather

Research in Astronomy and Astrophysics 2015年第1期15卷 85-106页

作者： balveer s.rathore Dinesh C.Gupta subhash C.Kaushik school of study in Physics Jiwaji UniversityGwalior Madhya Pradesh India

Today’s challenge for space weather research is to quantitatively predict the dynamics of the magnetosphere from measured solar wind and interplanetary magnetic field（IMF） conditions. Correlative studies between geomagnetic storms（GMss）and the various interplanetary（IP） field/plasma parameters have been performed to search for the causes of geomagnetic activity and develop models for predicting the occurrence of GMss, which are important for space weather predictions. We find a possible relation between GMss and solar wind and IMF parameters in three different situations and also derived the linear relation for all parameters in three *** the basis of the present statistical study, we develop an empirical model. With the help of this model, we can predict all categories of GMss. This model is based on the following fact： the total IMF Btotalcan be used to trigger an alarm for GMss, when sudden changes in total magnetic field Btotaloccur. This is the first alarm condition for a storm’s arrival. It is observed in the present study that the southward Bzcomponent of the IMF is an important factor for describing GMss. A result of the paper is that the magnitude of Bzis maximum neither during the initial phase（at the instant of the IP shock） nor during the main phase（at the instant of Disturbance storm time（Dst） minimum）. It is seen in this study that there is a time delay between the maximum value of southward Bzand the Dst minimum, and this time delay can be used in the prediction of the intensity of a magnetic storm two-three hours before the main phase of a GMs. A linear relation has been derived between the maximum value of the southward component of Bzand the Dst, which is Dst =（-0.06）＋（7.65）Bz＋ *** auxiliary conditions should be fulfilled with this, for example the speed of the solar wind should, on average, be 350 km s-1 to 750 km s-1, plasma β should be low and, most importantly, plasma temperature should be low for intense storms. If the plasma tem

关键词： solar wind geomagnetic storms(GMss) interplanetary magnetic field(IMF)

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Relation between solar Wind Parameter and Geomagnetic storm Condition during Cycle-23

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International Journal of Geosciences 2014年第13期5卷 1602-1608页

作者： balveer s. rathore Dinesh C. Gupta K. K. Parashar school of study in Physics Jiwaji University Gwalior India

In the present paper dependence of geomagnetic activity on the solar-wind plasma and interplanetary magnetic field (IMF) parameters has been studied. We have taken interplanetary solar wind data at the instant of Dst minimum. Our study consists of 200 geomagnetic storms weighed by disturbance storm time (Dst) -50 nT, observed during solar cycle 23. The study suggests that the strength of the geomagnetic storm is strongly dependent on the total magnetic field Btotal. The correlation (-0.72) has been found reasonable. In perspective of previous studies, the strength of the geomagnetic storm is strongly dependent on the southward component (Bz) whereas in present study exposes that the correlation (0.22) is weak. This result indicates that solar wind southward magnetic field component Bz has significant growth particularly before the main phase of geomagnetic storm (not during the main phase). The present result implies that neither density nor temperature is significantly related to the variation of geomagnetic disturbance;rather the effects of the pressure and speed. However, a low plasma beta during highly geoeffective event seems to be an important criterion.

关键词： Geomagnetic storm Interplanetary Magnetic Field (IMF) Disturbance storm Time (Dst) solar Cycle

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