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Peculiar Current Solar-Minimum Structure of the Heliosphere

Published online by Cambridge University Press:  21 October 2010

P. K. Manoharan
P. K. Manoharan*
Affiliation:
Radio Astronomy Centre, National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Udhagamandalam (Ooty), 643001, India email: mano@ncra.tifr.res.in
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Abstract

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In this paper, I review the results of 3-D evolution of the inner heliosphere over the solar cycle 23, based on observations of interplanetary scintillation (IPS) made at 327 MHz using the Ooty Radio Telescope. The large-scale features of solar wind speed and density turbulence of the current minimum are remarkably different from that of the previous cycle. The results on the solar wind density turbulence show that (1) the current solar minimum is experiencing a low level of coronal density turbulence, to a present value of ~50% lower than the previous similar phase, and (2) the scattering diameter of the corona has decreased steadily after the year 2003. The results on solar wind speed are consistent with the magnetic field strength at the poles and the warping of heliospheric current sheet.

Keywords

turbulencescatteringSun: coronaSun: magnetic fieldsSun: coronal mass ejections (CMEs)solar windsolar-terrestrial relations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Highlights H15: Highlights of Astronomy , November 2009 , pp. 484 - 487
Copyright
Copyright © International Astronomical Union 2010

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