It was verified that TS05 is efficient to reproduce the X component of terrestrial magnetospheric field at mid-latitudes during high geomagnetic activity time, with correlations r ≥ 0.7 in ∼50% of compared data, presenting a lower efficiency during calm time, with correlations r ≥ 0.7 only in ∼30% of data compared. It was found that TS05 model is a useful tool to explain ground-based North-South (or X) component of geomagnetic activity at mid-latitudes, in terms of main current sources. An evaluation of TS05 model is presented, in order to determine the model ability to reproduce both the total magnetospheric transient signal and to explain this signal through the contribution of each TS05 magnetospheric current system at ground level, comparing them with hourly data of the four geomagnetic stations selected. #FIELD ANGLE OMNIWEB SERIES#For this purpose, I compared the synthetic series of six magnetospheric current systems computed with the data-based semi-empirical model of Tsyganenko and Sitnov 2005 (TS05), with the measurements of four mid-latitude geomagnetic stations at very near geomagnetic latitudes, but well apart in longitude (Coimbra (COI), Portugal Panagyurishte (PAG), Bulgary Novosibirsk (NVS), Russia Boulder (BOU), USA), and with other ground and satellite-based solar, interplanetary and geomagnetic parameters obtained from the OMNI/NASA database. Powered By Konfrenzi Ultimate 1.The focus of this thesis is to identify the role and dynamics of different current systems for storm-time activity at mid-latitude ground level and their relation with other solar, interplanetary and geomagnetic parameters, in the 2007-2016 time interval. Share your abstract link to your social media or profile page | Corresponding Author (Afia Izza Fadiyah) Keywords: Interplanetary Magnetic Field, Cone Angle, Clock Angle, Geomagnetic Index But the 23rd solar cycle shows the northward clock angle can also cause an extreme geomagnetic storms. Other than that, the reconnection in magnetopause mostly occur when the the clock angle between 140 deg-252 deg or when the clock angle directions are southward. It makes the peak of the charts shifted from minimum phase to maximum phase. The plot of clock angle to Dst index as a geomagnetic index for each solar cycle were also derived.īased on the analysis, solar cycles are indicated gives an impact to the magnitude of each IMF components. Their frequency distribution charts on each solar cycle of 20 to 24 and its maximum phase and minimum phase are the key point for the analysis. IMF also interact with magnetosphere and it can cause the geomagnetic storms.Ĭone angle and clock angle are derived from IMF components on X-axis, Y-axis, and Z-axis. Both magnetic events of IMF and sunspots indicate the relation between solar cycles and IMF orientation which is clock angle and cone angle. Solar cycles are measured in terms of variations in the number of sunspots and its polarity. IMF parameters, sunspot number, and geomagnetic index are downloaded from OMNIWeb which the data were obtained from several spacecrafts in geocentric and lagrange orbits. Moreover, solar magnetic storms are connected by IMF. Variations of IMF depend on solar surface activities, e.g. Interplanetary magnetic field (IMF) carried by solar wind and rooted at corona. Variations of IMF Cone Angle and IMF Clock Angle on Solar Cycles and Geomagnetic StormsĪfia Izza Fadiyah (a*), Dhani Herdiwijaya (b)įaculty of Mathematics and Natural Sciences, Bandung Institute of Technology
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