Time variations of the magnetic field at the heliospheric termination shock - Galactic cosmic-ray modulation

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/123456789/25665
dc.subject.classification	Astronomy & Astrophysics	en
dc.subject.other	MERGED INTERACTION REGIONS	en
dc.subject.other	DEPENDENT DRIFT MODEL	en
dc.subject.other	SOLAR-WIND	en
dc.subject.other	SIMULATED FEATURES	en
dc.subject.other	OUTER HELIOSPHERE	en
dc.subject.other	GRADIENTS	en
dc.subject.other	DISTANCE	en
dc.subject.other	BOUNDARY	en
dc.subject.other	CYCLES	en
dc.subject.other	SHEET	en
dc.title	Time variations of the magnetic field at the heliospheric termination shock - Galactic cosmic-ray modulation	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	In this work we apply Parker's model for the solar wind expansion to estimate the magnetic field at the heliospheric termination shock, using in-ecliptic measurements from different spacecraft at 1 AU near the Earth, and study the effects of its temporal variation on the galactic cosmic-ray long-term modulation. We find that, for a time period of approximately two 11-year solar cycles from 1970 to 1995, the magnetic field at 1 AU extrapolated to the heliospheric termination shock anticorrelates very well with the cosmic-ray intensity measured from cosmic-ray ground stations. The correlation between the cosmic-ray intensity and the interplanetary magnetic field at 1 AU is generally lower. From this study it becomes evident that the modulation of cosmic-rays is substantially governed by the shielding of the heliosphere by the heliospheric termination shock magnetic field.	en
heal.publisher	KLUWER ACADEMIC PUBL	en
heal.journalName	SOLAR PHYSICS	en
dc.identifier.isi	ISI:000082534900012	en
dc.identifier.volume	187	en
dc.identifier.issue	1	en
dc.identifier.spage	157	en
dc.identifier.epage	175	en