Anomalous expansion of coronal mass ejections during solar cycle 24 and its space weather implications

2014
journal article
article
118
cris.lastimport.wos2024-04-10T00:00:17Z
dc.abstract.enThe familiar correlation between the speed and angular width of coronal mass ejections (CMEs) is also found in solar cycle 24, but the regression line has a larger slope: for a given CME speed, cycle 24 CMEs are significantly wider than those in cycle 23. The slope change indicates a significant change in the physical state of the heliosphere, due to the weak solar activity. The total pressure in the heliosphere (magnetic + plasma) is reduced by ~40%, which leads to the anomalous expansion of CMEs explaining the increased slope. The excess CME expansion contributes to the diminished effectiveness of CMEs in producing magnetic storms during cycle 24, both because the magnetic content of the CMEs is diluted and also because of the weaker ambient fields. The reduced magnetic field in the heliosphere may contribute to the lack of solar energetic particles accelerated to very high energies during this cycle.pl
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomicznepl
dc.contributor.authorGopalswamy, Natpl
dc.contributor.authorAkiyama, Sachikopl
dc.contributor.authorYashiro, Seijipl
dc.contributor.authorXie, Hongpl
dc.contributor.authorMäkelä, Perttipl
dc.contributor.authorMichałek, Grzegorz - 130530 pl
dc.date.accessioned2015-04-27T13:25:57Z
dc.date.available2015-04-27T13:25:57Z
dc.date.issued2014pl
dc.date.openaccess0
dc.description.accesstimew momencie opublikowania
dc.description.number8pl
dc.description.physical2673-2680pl
dc.description.versionostateczna wersja wydawcy
dc.description.volume41pl
dc.identifier.doi10.1002/2014GL059858pl
dc.identifier.eissn1944-8007pl
dc.identifier.issn0094-8276pl
dc.identifier.urihttp://ruj.uj.edu.pl/xmlui/handle/item/5879
dc.languageengpl
dc.language.containerengpl
dc.rights.licenceCC-BY
dc.share.typeotwarte czasopismo
dc.subject.encoronal mass ejectionspl
dc.subject.enanomalous expansionpl
dc.subject.engeomagentic stormspl
dc.subject.ensolar energetic particle eventspl
dc.subject.enspace weatherpl
dc.subject.ensolar cycle 24pl
dc.subtypeArticlepl
dc.titleAnomalous expansion of coronal mass ejections during solar cycle 24 and its space weather implicationspl
dc.title.journalGeophysical Research Letterspl
dc.typeJournalArticlepl
dspace.entity.typePublication
cris.lastimport.wos
2024-04-10T00:00:17Z
dc.abstract.enpl
The familiar correlation between the speed and angular width of coronal mass ejections (CMEs) is also found in solar cycle 24, but the regression line has a larger slope: for a given CME speed, cycle 24 CMEs are significantly wider than those in cycle 23. The slope change indicates a significant change in the physical state of the heliosphere, due to the weak solar activity. The total pressure in the heliosphere (magnetic + plasma) is reduced by ~40%, which leads to the anomalous expansion of CMEs explaining the increased slope. The excess CME expansion contributes to the diminished effectiveness of CMEs in producing magnetic storms during cycle 24, both because the magnetic content of the CMEs is diluted and also because of the weaker ambient fields. The reduced magnetic field in the heliosphere may contribute to the lack of solar energetic particles accelerated to very high energies during this cycle.
dc.affiliationpl
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne
dc.contributor.authorpl
Gopalswamy, Nat
dc.contributor.authorpl
Akiyama, Sachiko
dc.contributor.authorpl
Yashiro, Seiji
dc.contributor.authorpl
Xie, Hong
dc.contributor.authorpl
Mäkelä, Pertti
dc.contributor.authorpl
Michałek, Grzegorz - 130530
dc.date.accessioned
2015-04-27T13:25:57Z
dc.date.available
2015-04-27T13:25:57Z
dc.date.issuedpl
2014
dc.date.openaccess
0
dc.description.accesstime
w momencie opublikowania
dc.description.numberpl
8
dc.description.physicalpl
2673-2680
dc.description.version
ostateczna wersja wydawcy
dc.description.volumepl
41
dc.identifier.doipl
10.1002/2014GL059858
dc.identifier.eissnpl
1944-8007
dc.identifier.issnpl
0094-8276
dc.identifier.uri
http://ruj.uj.edu.pl/xmlui/handle/item/5879
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights.licence
CC-BY
dc.share.type
otwarte czasopismo
dc.subject.enpl
coronal mass ejections
dc.subject.enpl
anomalous expansion
dc.subject.enpl
geomagentic storms
dc.subject.enpl
solar energetic particle events
dc.subject.enpl
space weather
dc.subject.enpl
solar cycle 24
dc.subtypepl
Article
dc.titlepl
Anomalous expansion of coronal mass ejections during solar cycle 24 and its space weather implications
dc.title.journalpl
Geophysical Research Letters
dc.typepl
JournalArticle
dspace.entity.type
Publication

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