yGeomagnetic storm observed on 17 February 1998z
Observatory
Commencing time
Ending time
Geomagnetic field
Geoelectric field
Type (sudden/gradual)
Amplitude of abrupt onset H (nT)
g(nT)
Range
Range
Hour Minute (UTC)
Date Time (UTC)
Horizontal component H (nT)
Declination D (arcminute)
Vertical component Z (nT)
East-west component (mV/km)
North-south component (mV/km)
Memambetsu
13.2h
18d 24m
gradual
89
16.9
28
(*) Time is in UTC (Universal Time Coordinated).
(*) Time is given in 1-minute increments for the sudden commencement type and in 0.1-hour increments for the gradual commencement type.
(*) "-1" is displayed for the range, when it is unknown due to missing measurements, etc.
(*) The range may not be determined for a storm which is followed by the next one before its ending (the ending time is indicated by "C").
