onr:"swepub:oai:DiVA.org:kth-28586"
Sökning: onr:"swepub:oai:DiVA.org:kth-28586" > Occurrence and prop...
- 1 av 1
- Föregående post
- Nästa post
- Till träfflistan
Occurrence and properties of substorms associated with pseudobreakups
-
- Kullen, Anita (författare)
- KTH,Rymd- och plasmafysik
-
- Karlsson, Tomas (författare)
- KTH,Rymd- och plasmafysik
-
- Cumnock, Judy A. (författare)
- KTH,Rymd- och plasmafysik
- visa fler...
- visa färre...
- (creator_code:org_t)
- 2010
- 2010
- Engelska.
- Ingår i: Journal of Geophysical Research. - 0148-0227 .- 2156-2202. ; 115, s. A12310-
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- 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
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- solar-wind
- pseudo-breakup
- auroral oval
- polar-cap
- convection
- disturbances
- ionosphere
- dynamics
- flows
- Astronomy and astrophysics
- Astronomi och astrofysik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
- Journal of Geophysical Research (Sök värdpublikationen i LIBRIS)
Till lärosätets databas
- 1 av 1
- Föregående post
- Nästa post
- Till träfflistan
Hitta mer i SwePub
- Av författaren/redakt...
- Kullen, Anita
- Karlsson, Tomas
- Cumnock, Judy A.
- Sundberg, Torbjö ...
- Om ämnet
-
- NATURVETENSKAP
- NATURVETENSKAP
- och Fysik
- och Astronomi astrof ...
- Artiklar i publikationen
- Journal of Geoph ...
- Av lärosätet
- Kungliga Tekniska Högskolan
Sök utanför SwePub
- Sök vidare i:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - Nationella bibliotekssystem
- LIBRIS.kb.se
