Occurrence and properties of substorms associated with pseudobreakups

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Fältnamn	Indikatorer	Metadata
000		03457naa a2200457 4500
001		oai:DiVA.org:kth-28586
003		SwePub
008		110117s2010 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-285862 URI
024	7	a https://doi.org/10.1029/2010JA0158662 DOI
040		a (SwePub)kth
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Kullen, Anitau KTH,Rymd- och plasmafysik4 aut0 (Swepub:kth)u1yjgq07
245	1 0	a Occurrence and properties of substorms associated with pseudobreakups
264	1	c 2010
338		a print2 rdacarrier
500		a QC 20110117
520		a 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.
650	7	a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe
650	7	a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng
653		a solar-wind
653		a pseudo-breakup
653		a auroral oval
653		a polar-cap
653		a convection
653		a disturbances
653		a ionosphere
653		a dynamics
653		a flows
653		a Astronomy and astrophysics
653		a Astronomi och astrofysik
700	1	a Karlsson, Tomasu KTH,Rymd- och plasmafysik4 aut0 (Swepub:kth)u154ti5p
700	1	a Cumnock, Judy A.u KTH,Rymd- och plasmafysik4 aut0 (Swepub:kth)u1qhxemy
700	1	a Sundberg, Torbjörnu KTH,Rymd- och plasmafysik4 aut0 (Swepub:kth)u1mpz25b
710	2	a KTHb Rymd- och plasmafysik4 org
773	0	t Journal of Geophysical Researchg 115, s. A12310-q 115<A12310-x 0148-0227x 2156-2202
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-28586
856	4 8	u https://doi.org/10.1029/2010JA015866

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Av författaren/redakt...: Kullen, Anita; Karlsson, Tomas; Cumnock, Judy A.; Sundberg, Torbjö ...

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