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I

INTERPLANETARY MAGNETIC FIELD (IMF)

The magnetic field carried with the SOLAR WIND.

IONOSPHERE

The region of the earth's upper atmosphere containing a small percentage of free electrons and ions produced by photoioniza- tion of the constituents of the atmosphere by solar ultraviolet radiation at very short wavelengths (l.t.1000 angstroms). The ionosphere significantly influences radiowave propagation of fre- quencies less than about 30 MHz.

IONOSPHERIC STORM

A disturbance in the F REGION of the IONOSPHERE, which occurs in connection with geomagnetic activity.