An estimation of the shape and temporal variation of the solar wind sonic, Alfvenic and fast magnetosonic surfaces

Exarhos, G; Moussas, X

dc.contributor.author	Exarhos, G	en
dc.contributor.author	Moussas, X	en
dc.date.accessioned	2014-03-01T01:49:45Z
dc.date.available	2014-03-01T01:49:45Z
dc.date.issued	2000	en
dc.identifier.issn	0004-6361	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25908
dc.subject	hydrodynamics	en
dc.subject	sun : solar wind	en
dc.subject.classification	Astronomy & Astrophysics	en
dc.subject.other	HYDRODYNAMIC SOLUTIONS	en
dc.subject.other	STELLAR WINDS	en
dc.subject.other	FLOWS	en
dc.title	An estimation of the shape and temporal variation of the solar wind sonic, Alfvenic and fast magnetosonic surfaces	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	In this work we find the shape and dimension of the solar wind transition surfaces, namely the slow (sonic), the fast magnetosonic and the Alfven surface, as a function of heliospheric latitude using actual experimental data from Ulysses spacecraft during its first pole to pole journey. We also give the temporal variation of the radius of these surfaces using measurements from spacecraft at 1 AU. All transition surfaces are equatorial elongated. The sonic surface is the most asymmetric surface with polar radius similar to 1.5R. and equatorial radius similar to 2R.. The Alfven and the fast magnetosonic surfaces seems to be less asymmetric. The Alfven polar and equatorial radius is similar to 14R. and similar to 17R. respectively while the fast magnetosonic polar and equatorial radius is similar to 15R. and similar to 18R. respectively. The temporal variation of the transition surfaces radii follows the I I-year solar cycle except for the sonic radius which seems not to vary remarkably with time.	en
heal.publisher	SPRINGER VERLAG	en
heal.journalName	ASTRONOMY & ASTROPHYSICS	en
dc.identifier.isi	ISI:000086869300045	en
dc.identifier.volume	356	en
dc.identifier.issue	1	en
dc.identifier.spage	315	en
dc.identifier.epage	318	en