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  • Kullen, AnitaKTH,Rymd- och plasmafysik (författare)

Occurrence and properties of substorms associated with pseudobreakups

  • Artikel/kapitelEngelska2010

Förlag, utgivningsår, omfång ...

  • 2010
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:kth-28586
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-28586URI
  • https://doi.org/10.1029/2010JA015866DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • QC 20110117
  • We investigate how substorms with and without growth-phase pseudobreakups are affected by solar wind and ionospheric conditions. The study is based on 874 events identified with Polar UVI. An AE index analysis shows that substorms with growth-phase pseudobreakups are typically weak and appear as isolated events after hours of low geomagnetic activity. During the hours before onset the average solar wind merging field E-m is weaker, and the length of time with enhanced values shorter than for regular substorms. Integrating E-m over the last southward IMF period before onset shows an upper limit above which these substorms do not occur. To estimate how much E-m reaches the ionosphere, polar cap potential drop and unified PC indices are examined. It is found that substorms with growth-phase pseudobreakups have on average lower PC index values than regular substorms. The temporal evolution of the PC indices is similar for both substorm groups; the summer index correlates better with E-m, the winter index with AE. Also the average polar cap potential drop curves for both types of substorms resemble one other; the dayside and nightside curves are mainly influenced by E-m and AE, respectively. Comparing growth-phase, isolated and recovery pseudobreakups shows that solar wind and ionospheric conditions around the first substorm after a pseudobreakup are similar, independent of whether the last pseudobreakup appeared hours (recovery and isolated pseudobreakups) or minutes before substorm onset (growth-phase pseudobreakups). Isolated and recovery pseudobreakups are less often associated with a northward IMF rotation than growth-phase pseudobreakups or substorms.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Karlsson, TomasKTH,Rymd- och plasmafysik(Swepub:kth)u154ti5p (författare)
  • Cumnock, Judy A.KTH,Rymd- och plasmafysik(Swepub:kth)u1qhxemy (författare)
  • Sundberg, TorbjörnKTH,Rymd- och plasmafysik(Swepub:kth)u1mpz25b (författare)
  • KTHRymd- och plasmafysik (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Journal of Geophysical Research115, s. A12310-0148-02272156-2202

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