On recurrent Forbush Decreases

The methods of nonparametric and multivariate statistics were used to study features of recurrent Forbush decreases (FDs) and to compare them with sporadic ones. The FEID database created and maintained in IZMIRAN allowed us to distinguish isolated FDs caused by high-speed streams from coronal holes...

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Bibliographic Details
Published in:Journal of physics. Conference series 2019-02, Vol.1181 (1), p.12009
Main Authors: Melkumyan, A, Belov, A, Abunina, M, Abunin, A, Eroshenko, E, Oleneva, V, Yanke, V
Format: Article
Language:English
Subjects:
Coronal holes
Coronal mass ejection
Correlation coefficients
Disturbances
Forbush decreases
Parameters
Solar corona
Solar cycle
Solar wind
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Summary:The methods of nonparametric and multivariate statistics were used to study features of recurrent Forbush decreases (FDs) and to compare them with sporadic ones. The FEID database created and maintained in IZMIRAN allowed us to distinguish isolated FDs caused by high-speed streams from coronal holes (350 events) and by interplanetary disturbances from coronal mass ejections (207 events). Distributions of all parameters turned out to be more compact and to have smaller medians for recurrent events than for sporadic ones. Comparison of distributions of FD magnitude for different groups of events suggested that most FDs were related to coronal holes during the minimum between solar cycles 23 and 24. Multiple correlation coefficients between FD parameters and a set of solar wind parameters revealed that recurrent FDs depends less strongly on the characteristics of interplanetary disturbances than sporadic ones.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1181/1/012009