TERMIUM Plus^®

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Record number: 1, Textual support number: 1 CONT

As a CME [Coronal Mass Ejection] hits the magnetosphere, the compression of the magnetic field produces an increase in the field measured at ground level. This gives a characteristic rise in the field and is known as a Sudden Storm Commencement (SSC). Not all SSCs are followed by auroral activity, but it is a good early indicator. If the solar wind speed and IMF [Interplanetary Magnetic Field] direction are favourable, the energy in the magnetosphere will gradually build up into a large storm, with the magnetic field decreasing and changing rapidly.  2, fiche 1, Anglais, - sudden%20storm%20commencement

Record number: 1, Textual support number: 2 CONT

Plasma from a solar eruption impacted the Earth's magnetic field causing a sudden storm commencement (SSC) and the possible beginning of a significant geomagnetic storm.  3, fiche 1, Anglais, - sudden%20storm%20commencement

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