Definition of substorm in US English:



  • A localized disturbance of the earth's magnetic field in high latitudes, typically manifested as an aurora.

    • ‘A magnetospheric substorm has three distinct phases: growth, expansion, and recovery.’
    • ‘NASA satellites and ground observatories will be able to study the solar substorms behind aurora borealis.’
    • ‘A typical example of how both missions will co-operate is the study of the magnetic substorms producing the bright aurorae.’
    • ‘The jagged peaks mark the arrival of electrons in substorms, and they gradually drift away again.’
    • ‘Observations from satellites and from widely-spaced observing points on the earth's surface show that substorms typically originate at the auroral zone on that part of the earth opposite the sun.’