Table 1

Hourly average storm intensities Dⁱ, equation (5), calculated using the four standard observatories, Hermanus (HER), Kakioka (KAK), Honolulu (HON), and San Juan (SJG); and relative residual differences ${\mathit{\delta }}_{\mathit{n}}^{\mathit{i}}$, equation (6), for Alibag (ABG), HER, KAK, HON, SJG, each for selected storms (1989–2015). Month (Mn), Day (Dy), Hour (Hr, UT). Data are shown in Figure 2. No ${\mathit{\delta }}_{\mathit{n}}^{\mathit{i}}$ values are listed if no observatory data are available.

Year	Mn	Dy	Hr	Di (nT)	${\mathit{\delta }}_{\mathbf{ABG}}^{\mathit{i}}$	${\mathit{\delta }}_{\mathbf{HER}}^{\mathit{i}}$	${\mathit{\delta }}_{\mathbf{KAK}}^{\mathit{i}}$	${\mathit{\delta }}_{\mathbf{HON}}^{\mathit{i}}$	${\mathit{\delta }}_{\mathbf{SJG}}^{\mathit{i}}$
1989	03	14	01	593		–0.0430	+0.0331	+0.0122
1991	11	09	01	379		–0.0307	+0.0142	–0.0182	+0.0438
1991	03	25	00	295		–0.0070	+0.0003	–0.0117	–0.0102
1990	04	10	15	291		+0.0077	+0.0116	–0.0097	–0.0316
1992	05	10	14	284		–0.0057	–0.0208	–0.0082	+0.0004
1991	10	29	08	279		+0.0144	–0.0314	+0.0140
2003	11	20	20	427	+0.0157	–0.0379	–0.0052		–0.0025
2003	10	30	22	384	+0.0020	–0.0356	–0.0279	–0.0192	–0.0186
2001	03	31	08	382	–0.0099	+0.0151	–0.0198	+0.0078	–0.0121
2004	11	08	06	371	+0.0206	–0.0016	+0.0187	+0.0341	–0.0223
2000	07	16	00	301	+0.0155	+0.0037	–0.0089	–0.0190	–0.0008
2000	04	06	22	297	–0.0281	–0.0308	–0.0318
2015	03	17	22	232	–0.0246	–0.0136	–0.0387	–0.0221	–0.0052
2015	06	23	04	195	–0.0190	–0.0067	–0.0122	–0.0219	–0.0214
2015	12	20	22	164	+0.0008	–0.0096	–0.0288	–0.0301	+0.0000
2012	03	09	08	141	+0.0050	+0.0257	+0.0332	+0.0180	–0.0302
2012	07	15	16	141	+0.0181	+0.0020	+0.0237		–0.0125
2011	10	25	01	140	–0.0119	–0.0278	+0.0208	–0.0174	+0.0251