The GOES Hp plot contains the 1-minute averaged parallel
component of the magnetic field in nanoTeslas (nT), as measured at GOES-13 (W75) and GOES-11 (W135). The Hp component is
perpendicular to the satellite orbit plane and Hp is essentially parallel to
Earth's rotation axis. If these data drop to near zero, or less, when the
satellite is on the dayside it may be due to a compression of Earth's
magnetopause to within geosynchronous orbit, exposing satellites to negative
and/or highly variable magnetic fields. On the nightside, a near zero, or
less, value of the field indicates strong currents that are often associated
with substorms and an intensification of currents in the Earth's geomagnetic
tail.

January 10, 2011 -- GOES 15 will Replace GOES 11 as
Secondary SWPC GOES Proton, Electron and Magnetometer Satellite the end of
February. See Details

Noon and midnight local time at the satellite are plotted
as N and M. Default scaling is 0 to 200 nanoTesla. Non-default scaling to
include infrequent extreme values is lableled in red to emphasize the change
in scale.

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