Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume 108, Issue A7, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2002JA009504
Keywords
solar flares; interplanetary CMEs; extreme magnetic storms; auroras; space weather
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[1] The 1 - 2 September 1859 magnetic storm was the most intense in recorded history on the basis of previously reported ground observations and on newly reduced ground-based magnetic field data. Using empirical results on the interplanetary magnetic field strengths of magnetic clouds versus velocities, we show that the 1 September 1859 Carrington solar flare most likely had an associated intense magnetic cloud ejection which led to a storm on Earth of D-ST similar to - 1760 nT. This is consistent with the Colaba, India local noon magnetic response of DeltaH = 1600 +/- 10 nT. It is found that both the 1 - 2 September 1859 solar flare energy and the associated coronal mass ejection speed were extremely high but not unique. Other events with more intense properties have been detected; thus a storm of this or even greater intensity may occur again. Because the data for the high-energy tails of solar flares and magnetic storms are extremely sparse, the tail distributions and therefore the probabilities of occurrence cannot be assigned with any reasonable accuracy. A further complication is a lack of knowledge of the saturation mechanisms of flares and magnetic storms. These topics are discussed in some detail.
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