Time variations of the heliospheric termination shock radius

Exarhos, G; Moussas, X

dc.contributor.author	Exarhos, G	en
dc.contributor.author	Moussas, X	en
dc.date.accessioned	2014-03-01T01:49:05Z
dc.date.available	2014-03-01T01:49:05Z
dc.date.issued	1999	en
dc.identifier.issn	0038-0938	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25664
dc.subject.classification	Astronomy & Astrophysics	en
dc.subject.other	LOCAL INTERSTELLAR-MEDIUM	en
dc.subject.other	SOLAR-CYCLE VARIATIONS	en
dc.subject.other	COSMIC-RAY GRADIENTS	en
dc.subject.other	OUTER HELIOSPHERE	en
dc.subject.other	FLOW DOWNSTREAM	en
dc.subject.other	WIND PLASMA	en
dc.subject.other	HELIOPAUSE	en
dc.subject.other	BOUNDARY	en
dc.subject.other	ASYMMETRY	en
dc.subject.other	DISTANCE	en
dc.title	Time variations of the heliospheric termination shock radius	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	In this work we study the temporal variation of the heliospheric termination shock radius using in-ecliptic combined measurements from different spacecraft at 1 AU near the Earth. The results show that the radius of the heliospheric termination shock varies in time with a period of 11 years. During some 11-year time periods the shock radius anti-correlates with the solar cycle activity, specifically with the sunspot number. The average radius is approximately 115 AU with minimum value similar to 80 AU and maximum value similar to 150 AU. These values are the upper limits since we do not take into account the charge exchange effects of solar wind with the interstellar neutrals. We also compare the results with those from other spacecraft (Helios 1 and Voyager 2). We find that Helios 1 measurements give almost the same result as the one obtained from measurements at 1 AU while Voyager 2 measurements give a heliospheric termination shock radius approximately 15 AU lower.	en
heal.publisher	KLUWER ACADEMIC PUBL	en
heal.journalName	SOLAR PHYSICS	en
dc.identifier.isi	ISI:000082534900011	en
dc.identifier.volume	187	en
dc.identifier.issue	1	en
dc.identifier.spage	145	en
dc.identifier.epage	155	en