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GEM Storm Intervals |
Other Storm Intervals |
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March 1998 |
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May 1998 |
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June 1998 |
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August 1998 |
Overlapping stack plot of the magnetograms of ground-based
magnetometers located in low and middle magnetic latitudes during
the storm. The first 3 letters designate the IAGA code of that
station followed by a fourth letter designating the component
of the field that is being recorded at that station (essentially
local magnetic north) as a function of universal time (UT). The
base lines (dotted line) at each station represents the mean value
that has been removed from the data to show the variation around
that value. The stations shown here are distributed in magnetic
local time around the Earth, beginning with GNA (Gnangara, Australia),
LNP (Lunping, Taiwan), KAK & MMB (Kakioka & Memambetsu,
Japan), GUA (Guam), HON (Honolulu), EYR (Eyrewell), FRN (Fresno,
CA), TUC (Tuscon, AZ), BOU (Boulder, Colorado), BSL (Bay St Louis,
MS), FRD (Fredericksburg, VA), SJG (San Juan, Puerto Rico), MBO
(Mbour, Western Africa), HER (Hermanus, South Africa), BNG (Bangui,
Central Africa), FUR (Furstenfeldbruck, Germany), BDV (Budkov,
Czech Rep), CZT (Port Alfred, South Indian Ocean), TAN (Antannarivo,
Madagascar), and AMS (Amsterdam Is).
Magnetic Local Time (LT) vs. Univeral Time (UT) maps of the main phase of the storm, showing mid/low latitude of the axial (parallel to magnetic dipole axis) magnetic disturbance field obtained from ground-based magnetometer data shown above after having removed the effect from a quiet day (May 13) variation. The contours show magnetic disturbance at 25 nT intervals from the quiet day variation, with positive perturbations shaded in blue and negative ones shaded in redish colors.
C. Robert Clauer
Physics Research Laboratory
University of Michigan
2455 Hayward St.,
Ann Arbor, MI 48109-9821
734/763-6248
fax 734/763-2267
bob.clauer@umich.edu
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