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Titolo:
THE HELIOLATITUDINAL GRADIENT OF THE SOLAR-WIND DURING SOLAR MINIMUM CONDITIONS MODELED BY EXACT HYDRODYNAMIC SOLUTIONS
Autore:
LIMA J; TSINGANOS K;
Indirizzi:
UNIV OPORTO,FAC CIENCIAS,CTR ASTROFIS,RUA CAMPO ALEGRE P-4150 OPORTO PORTUGAL UNIV OPORTO,FAC CIENCIAS,GRP MATEMAT APLICADA OPORTO PORTUGAL UNIV CRETE IRAKLION CRETE GREECE FDN RES & TECHNOL HELLAS IRAKLION CRETE GREECE
Titolo Testata:
Geophysical research letters
fascicolo: 2, volume: 23, anno: 1996,
pagine: 117 - 120
SICI:
0094-8276(1996)23:2<117:THGOTS>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
VELOCITY; ROTATION; PIONEER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
J. Lima e K. Tsinganos, "THE HELIOLATITUDINAL GRADIENT OF THE SOLAR-WIND DURING SOLAR MINIMUM CONDITIONS MODELED BY EXACT HYDRODYNAMIC SOLUTIONS", Geophysical research letters, 23(2), 1996, pp. 117-120

Abstract

The heliolatitudinal dependence of observations of the solar wind macroscopic quantities such as the averaged proton speed and density is modelled during solar minimum conditions when the rotational and magnetic axes roughly coincide. Published observations via the technique of interplanetary scintillations for the previous two solar cycles were used, as well as recent data from the plasma experiment aboard the ULYSSES spacecraft, which also refer to the declining phase of the presentsolar cycle. A class of exact, two-dimensional solutions of the full set of steady HD equations is used which is obtained analytically through a nonlinear separation of the variables. The three parameters which emerge in these solutions are fixed from such observations, as well as from observations of solar rotation. The solutions are consistent with observational inferrences that during solar minimum and the declining phase of the solar activity cycle, there is a strong heliolatitudinal gradient in rotation averaged proton speed between about 400 - 800km s(-1) from equator to pole. This modelling also agrees with previous findings that the gradient in wind speed with the latitude is offset by a gradient in density such that the mass and momentum flux vary relatively little.

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Documento generato il 03/12/20 alle ore 21:51:30