Interplanetary Magnetic Field (IMF) is a part of the Solar magnetic field that is carried into interplanetary space by the solar wind. Based on previous study it is known that solar wind condition when reconnection occurs has important role on geomagnetic disturbance. This paper discusses low-latitude geomagnetic field responses to various condition of reconnection, i.e. when north-south component of Interplanetary Magnetic Field (IMF Bz) was south-directed (<0) in long duration, IMF Bz switch to opposite direction after reconnection, and neutral IMF Bz (~0). Case studies show that precondition which IMF Bz<0 prompt more intense geomagnetic storm compared to IMF Bz ~0. At low latitude, precondition of IMF Bz <0 tend to trigger disturbance in the form of geomagnetic storm, while the IMF Bz~0 one could trigger Sudden Impulse. Change of IMF Bz direction after reconnection affected recovery phase acceleration, that was on IMF Bz>0, recovery phase took less time compared to IMF Bz<0. AbstrakMedan magnet antarplanet (Interplanetary Magnetic Field/IMF) adalah medan magnet matahari yang dibawa oleh angin surya dan menjalar dalam ruang antarplanet. Berdasarkan studi sebelumnya diketahui bahwa kondisi angin surya saat terjadi rekoneksi amat berpengaruh terhadap gangguan geomagnet yang terjadi. Pada makalah ini dibahas respons medan geomagnet di lintang rendah pada berbagai kondisi rekoneksi yaitu pada saat komponen utara-selatan medan magnet antarplanet (IMF Bz) dominan selatan (IMF Bz<0) dalam durasi panjang, IMF Bz berbalik arah setelah rekoneksi, dan IMF Bz cenderung netral (IMF Bz~0). Dari studi kasus menunjukkan bahwa prakondisi IMF Bz <0 mengakibatkan badai geomagnet yang lebih intens dibandingkan IMF Bz~0. Di lintang rendah, prakondisi IMF Bz<0 cenderung mengakibatkan gangguan berupa badai geomagnet sedangkan IMF Bz~0 dapat memicu Sudden Impulse. Perubahan arah IMF Bz yang terjadi setelah rekoneksi mempengaruhi laju fase pemulihan (recovery phase), yaitu pada IMF Bz>0, fase pemulihannya cenderung berlangsung lebih cepat dibandingkan saat IMF Bz<0.
Study of Response of Extreme Meso-Scale Field-Aligned Current to Interplanetary Magnetic Field Components B<sub>X</sub>, B<sub>Y</sub> and B<sub>Z</sub> During Geomagnetic Storm
