A Correlative Study of Geomagnetic Storms Associated with Solar Wind and IMF Features During Solar Cycle 23

Abstract

Abstract-A geomagnetic storm is a global disturbance in Earth's magnetic field usually occurred due to abnormal conditions in the interplanetary magnetic field (IMF) and solar wind plasma emissions caused by various solar phenomenon. Furthermore the magnitude of these geomagnetic effects largely depend upon the configuration and strength of potentially geo-effective solar/interplanetary features. In the present study the identification of 220 geomagnetic storms associated with disturbance storm time (Dst) decrease of more than -50 nT to -300 nT, have been made, which are observed during 1996-2007, the time period spanning over solar cycle 23. The study is made statistically between the Dst strength (used as an indicator of the geomagnetic activity) and the peak value obtained by solar wind plasma parameters and IMF B as well as its components. We have used the hourly values of Dst index and the wind measurements taken by various satellites. Our results inferred that yearly occurrences of geomagnetic storms are strongly correlated with 11-year sunspot cycle. We observed that IMF B is highly geo-effective during the main phase of magnetic storms, while it more significant at the time of storm peak, which is further contributed by southward component of IMF Bz, substantiating earlier findings. The correlation between Dst and wind velocity is higher, as compared with IMF Bz and ion density. It has been verified that geomagnetic storm intensity is correlated well with the total magnetic field strength of IMF better than with its southward component.

Investigation of the relation between space-weather parameters and Forbush decreases automatically selected from Moscow and Apatity cosmic ray stations during solar cycle 23

“…By extension, disturbances in the solar wind, magnetosphere and FDs are triggered 273-2 by the same processes in the Sun. The study of these disturbances is important in our understanding of the dynamics of the solar-terrestrial environment since such activities can potentially result in life threatening issues ranging from satellite damage, communication failure to navigational difficulties (Joselyn & McIntosh 1981;Rathore et al 2011). This underscores the rationale for examining the impact of solar-geomagnetic characteristics on GCR intensity reductions.…”

Analisis Dampak Flare Tipe X September 2014 Terhadap Sistem Navigasi Dan Posisi Berbasis Satelit Dari Pengamatan Gistm Kupang

“…Perubahan kerapatan elektron tersebut apabila terjadi peningkatan elektron disebut sebagai badai positif sedangkan sebaliknya disebut sebagai badai negatif, dan tidak jarang dijumpai badai positif dan negatif muncul bersamaan tetapi pada lintang yang berbeda [10]. Dengan demikian kejadian badai geomagnet dan badai ionosfer tidak terlepas dari adanya CME, medan magnet antar planet (IMF, Interplanetary Magnetic Field) [11]. Peningkatan energi yang di transfer dari angin surya dan IMF ke dalam magnetosfer menunjukkan intensifikasi arus cincin [12] Terdapat tiga fase pembentukan badai geomagnet, yaitu fase awal, fase utama dan fase pemulihan.…”

A Study of the Relationship Between Southward Bz > -10 nT and Storm Time Disturbance Index During Solar Cycle 23

“…During an anti-parallel orientation of the interplanetary magnetic field (IMF) to the geomagnetic field lines, solar wind energy, momentum and mass could be transferred into the Earth's magnetosphere, thereby influencing its dynamics and geomagnetic storms. Landmark studies [3][4][5][6][7][8][9] have shown that B z , which is the north-south direction component of the IMF, is a good index that plays a vital role in the reconnection between the solar and terrestrial magnetic fields, leading to additional energy in the magnetospheric flux tube and the geoeffectiveness of geomagnetic storms. A southward B z , fluctuating in the corotating interacting regions (CIRs), is a prerequisite for magnetic reconnection leading to the development of geomagnetic storms [4] whereas, a northward B z rarely leads to storms except during extremely high solar wind speed [5,10].…”