This alerted the community to the impending arrival of the CME thereby allowing the event to be monitored in 'real-time' using the wide variety of ISTP instruments. This event provided the first ever end to end tracking of a space storm. Further, it provided a strong pressure pulse of extremely high density resulting in the compression of the magnetopause to within geosynchronous orbit during northward IMF conditions. Here we present an overview of the event and available observations. These events are particularly interesting as they show how the Sun can be the source of interplanetary disturbances, which dramatically affect the Earth.
Magnetic clouds are a subset of CMEs.
It had all the attributes of a magnetic cloud structure when it arrived at Earth and the resulting geomagnetic activity was small by comparison to the events seen during solar maximum. Complementing its unique and comprehensive measurements, ISTP is the first coordinated space physics effort that involves theoretical investigations from the outset as tools to bring closure between disparate observations. Four theory investigations, covering macro and meso scales, are part of the program. The signal reached saturation level immediately. WIND continued to detect these emissions until 0100 UT, January 11.