Suprathermal ions ahead of interplanetary shocks: New observations and critical instrumentation required for future space weather monitoring
作者： A. Posner , N. A. Schwadron , D. J. McComas , E. C. Roelof , A. B. Galvin
DOI: 10.1029/2004SW000079
关键词:
摘要: [1] We report new findings on the low-energy ion population associated with interplanetary (IP) shocks based Wind/Suprathermal Ion Composition Spectrometer (STICS) observations. Suprathermal ions (6–200 keV) are present in upstream region of most (86%) IP at 1 AU. These foreshock characterized by (1) median energy >25 keV, that is, higher than a thermal distribution; (2) spectra increase intensity range 10–30 keV; (3) flow predominantly outward (antisunward). In months surveyed, all forward speeds >30 km/s showed least one above features. Because these characteristics so often seen foreshocks, 5 to 100 keV can be used provide advance warning (∼5–72 hours) disturbances drivers hazardous geomagnetic storms. preshock suprathermal could readily monitored future space weather missions order predict arrival initiate events; here we define measurement requirements and describe implementation such an instrument.
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