Variations of time derivatives of the horizontal geomagnetic field and horizontal geomagnetic field along 96-degree magnetic meridian

Abstract

The  Energetic  particles  are  released  from  the  Sun  by  solar  flares  or  eruptive ejections  interaction  with  geomagnetic  field  producing  geomagnetic  storms  and  more ionization  in  the  ionosphere.  The  geomagnetic  substorms  are  classified  as  one  of  major factor  that  influence  geomagnetically  induced  currents  (GIC)  that  affect  the  operation  of technological system through the geomagnetic field variations. The direct representation of GIC is the time derivative of the horizontal geomagnetic field. 138 substorms onset events were  obtained  from  IMAGE  magnetometer  data  from  Northern  Europe,  using  Dst (Disturbance  storm  time)  to  determine  the  substorm  events  of  varying  strengths,  for  five stations (Addis Ababa, Abisko, Bangui Hermanus and Nurmijarvi). The data used in this study covers the periods from 1999 to 2001. Positive high correlation exhibited between the maximum  value  of  time  derivatives  of  the  horizontal  geomagnetic  field  (dH/dtmax)  and maximum value of horizontal geomagnetic field (max H). Also, Monthly variations of the maximum  value  of  time  derivatives  of  the  horizontal  geomagnetic  field  (dH/dtmax)  and maximum value of the horizontal geomagnetic field (max H) were also investigated.