Journal
GEOMAGNETISM AND AERONOMY
Volume 52, Issue 1, Pages 28-36Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0016793212010082
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Funding
- Russian Foundation for Basic Research [07-02-00042, 10-02-00277a]
- Division of Physical Sciences [15]
- Russian Academy of Sciences [P 4]
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The paper analyses the development of the main phase of magnetic storms with Dst <= -50 nT, the interplanetary source of which consists of eight types of solar wind streams: magnetic clouds (MC, 17 storms); corotating interaction regions (CIR, 49 storms); Ejecta (50 storms); compressed region (Sheath) before Ejecta Sh(E) (34 storms); the Sheath before a magnetic cloud Sh(MC) (6 storms); all Sheath before all ICME, Sh(E) + Sh(MC) (40 storms); all ICME, MC + Ejecta (67 storms); and an indeterminate type of stream IND (34 storms). Threshold value estimates of the integral electric field sumEy to attain an intensity level of moderate (Dst <= .50 nT) and strong (Dst <= -100 nT) magnetic storms indicate a tendency toward their dependence on the type of magnetic storm source. It can be assumed that, on average, Sheath before ICME have threshold values 1.5 times less that ICME themselves.
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