Equatorial electrojet

A snapshot of the variation of the Earth’s magnetic field from its intrinsic field at 400 km altitude, due to the ionsopheric current systems. The equatorial intensification of the magnetic field is due to the equatorial electrojet (EEJ). The EEJ peaks over the Indian Ocean at the point in time depicted. The map was generated using a geomagnetic field model.

EEJ magnetic signals measured by Ettaiyapuram Magnetic Observatory, India ( ETT - Operated by National Geophysical Research Institute, NGRI, Hyderabad). These data are averages of the daily difference between magnetic data (H) at Ettaiyapuram and Hyderabad collected over several years. The horizontal intensity of magnetic field peaks at ~12 LT. The build up flank in the morning hours is steeper than that of the decay phase.
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A movie of the variation of the geomagnetic field at the surface of the Earth due to the ionsopheric current systems. The equatorial intensification of the magnetic field is due to the Equatorial Electrojet (EEJ). UT = universal time. The unit is nT (nanotesla). The movie was generated using a geomagnetic field model (CM4).

The equatorial electrojet (EEJ) is a narrow ribbon of current flowing eastward in the day time equatorial region of the Earth's ionosphere. The abnormally large amplitude of variations in the horizontal components measured at equatorial geomagnetic observatories, as a result of EEJ, was noticed as early as 1920 from Huancayo geomagnetic observatory. Observations by radar, rockets, satellites, and geomagnetic observatories are used to study EEJ.

单词	Equatorial electrojet
释义	Equatorial electrojet 英语百科 Equatorial electrojet The equatorial electrojet (EEJ) is a narrow ribbon of current flowing eastward in the day time equatorial region of the Earth's ionosphere. The abnormally large amplitude of variations in the horizontal components measured at equatorial geomagnetic observatories, as a result of EEJ, was noticed as early as 1920 from Huancayo geomagnetic observatory. Observations by radar, rockets, satellites, and geomagnetic observatories are used to study EEJ.
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