Yong Gu Ji

Oct 12, 2023 | agupubs.onlinelibrary.wiley.com | Yong Gu Ji |Lan Ma |Chao Shen |Gang Zeng

1 Introduction SYM-H index is a geomagnetic index introduced to describe the strength of geomagnetic storms (Mayaud, 1980). It is determined by the 1-min average of the horizontal component of the geomagnetic disturbance measured by several ground stations located near the equatorial regions with low latitude, which is similar to Dst index with 1 hr resolution (Wanliss & Showalter, 2006).