On the Geoeffectiveness Structure of Solar Wind-Magnetosphere Coupling Functions during Intense Storms
Joint Authors
Kayode, J. Stephen
Ikubanni, S. Oluwole
Adebesin, B. Olufemi
Source
ISRN Astronomy and Astrophysics
Issue
Vol. 2011, Issue 2011 (31 Dec. 2011), pp.1-13, 13 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-01-17
Country of Publication
Egypt
No. of Pages
13
Main Subjects
Abstract EN
The geoeffectiveness of some coupling functions for the Solar Wind-Magnetosphere Interaction had been studied.
58 storms with peak Dst < −100 nT were used.
The result showed that the interplanetary magnetic field Bz appeared to be more relevant with the magnetic field B (which agreed with previous results).
However, both the V (solar wind flow speed) and Bz factors in the interplanetary dawn-dusk electric field (V×Bz) are effective in the generation of very intense storms (peak Dst < −250 nT) while “intense” storms (−250 nT ≤ peak Dst < −100 nT) are mostly enhanced by the Bz factor alone (in most cases).
The southward Bz duration BT seems to be more relevant for Dst < −250 nT class of storms and invariably determines the recovery phase duration.
Most of the storms were observed to occur at midnight hours (i.e., 2100–0400 UT), having a 41.2% incidence rate, with high frequency between 2300 UT and 0000 UT.
62% of the events were generated as a result of Magnetic Cloud (MC), while 38% were generated by complex ejecta.
The B-Bz relation for the magnetic cloud attained a correlation coefficient of 0.8922, while it is 0.7608 for the latter.
Conclusively, Bz appears to be the most geoeffective factor, and geoeffectiveness should be a factor that depends on methods of event identification and classification as well as the direction of event correlation.
American Psychological Association (APA)
Adebesin, B. Olufemi& Ikubanni, S. Oluwole& Kayode, J. Stephen. 2012. On the Geoeffectiveness Structure of Solar Wind-Magnetosphere Coupling Functions during Intense Storms. ISRN Astronomy and Astrophysics،Vol. 2011, no. 2011, pp.1-13.
https://search.emarefa.net/detail/BIM-511715
Modern Language Association (MLA)
Adebesin, B. Olufemi…[et al.]. On the Geoeffectiveness Structure of Solar Wind-Magnetosphere Coupling Functions during Intense Storms. ISRN Astronomy and Astrophysics No. 2011 (2011), pp.1-13.
https://search.emarefa.net/detail/BIM-511715
American Medical Association (AMA)
Adebesin, B. Olufemi& Ikubanni, S. Oluwole& Kayode, J. Stephen. On the Geoeffectiveness Structure of Solar Wind-Magnetosphere Coupling Functions during Intense Storms. ISRN Astronomy and Astrophysics. 2012. Vol. 2011, no. 2011, pp.1-13.
https://search.emarefa.net/detail/BIM-511715
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-511715