Evolution of the current system during solar wind pressure pulses based on aurora and magnetometer observations

Earth, Planets and Space

Table 1 Normal angle of the interplanetary shocks analyzed in this study

Event	Shock arrival UT at ACE	Shock arrival UT at WIND	Solar wind speed (km/s)	SYM-H rise time (min)	Time lag	MVA			Coplanarity
Event	Shock arrival UT at ACE	Shock arrival UT at WIND	Solar wind speed (km/s)	SYM-H rise time (min)	Shock normal angle (X–Y) (deg)	Shock normal angle (X-Y) (deg)	Shock normal angle (XY-Z) (deg)	Med/min eigenvalue ratio	Shock normal angle (X-Y) (deg)	Shock normal angle (XY-Z) (deg)
1 (June 14, 2005)	17:53:57	17:55:42	500	5	176	186	23	2.95	191	36
2 (July 07, 2012)	17:26:30	17:39:00	520	4	192	189	23	2.98	230	74
3 (April 26, 2004)	15:17:36	16:13:30	520	6	173	169	27	10.15	174	−14
4 (May 30, 2003)	15:55:13	15:52:49	750	2	194	211	3	2.90	155	−64

The event number, the shock arrival UT at ACE and WIND, the solar wind speed behind the shock, the SYM-H rise time, and the normal angles in the azimuthal (X-Y) and longitudinal (XY-Z) planes in the three methods are listed. The azimuthal and longitudinal angles are measured from the GSM +X axis toward the +Y axis and from the GSM +Z axis. The satellite locations are shown in Additional file 1: Figure S1, Additional file 2: Figure S2 and Additional file 4: Figure S4, Additional file 5: Figure S5