Abstract Details
| Name: Urmi Doshi Affiliation: M.P.Birla Institue of Fundamental Research, Bangalore Conference ID: ASI2018_389 Title : Geomagnetic Storms associated with isolated Halo CME’s during the period 1996-2014. Authors and Co-Authors : Ramesh,K.B.Formerly with Indian Institute of Astrophysics Abstract Type : Poster Abstract Category : Sun and the Solar System Abstract : We have studied 21 isolated geomagnetic storms (GMS) with an intensity of Dst< -50nT, that are associated with isolated front sided Halo Coronal Mass ejections (CME) which occurred during the period 1996–2014. All these GMS’s are associated with a Storm Sudden Commencement. The effect of the interplanetary magnetic field as well as the various solar wind plasma parameters on each of these events is analyzed. Analysis of the parameters such as Plasma temperature, the Z component of the interplanetary magnetic field (Bz), Solar wind speed and the Proton density have been found to play a crucial role in producing the GMS and also in the resultant storm strength. However, even though all the storms are associated with isolated Halo CME’s of varied initial speeds, the strength of the storm does not necessarily correlate with the initial CME speed and thus it appears to indicate that these events do not fit into the general statistical trends that relate the CME speed and the corresponding geoeffectiveness. We opine that the strength of the storm depends more on the location of the Earth in its orbit around the Sun with respect to the arrival of the solar ejecta at that location and the angular stretch of the ejecta, besides the necessary condition such as southward Bz. |