Author： Turova I.P. Grigoryeva S.A.
Publisher： Springer Publishing Company
ISSN： 0038-0938
Source： Solar Physics, Vol.197, Iss.1, 2000-11, pp. : 43-56
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
The ratios I(K_1)/I(H_1) and I(K_3)/I(H_3) were calculated from four semi-empirical models of sunspot umbra. We determined the dependencies of both ratios of such parameters as temperature gradient and atmospheric opacity. A certain influence on the expected ratios I(K_1)/I(H_1) and I(K_3)/I(H_3) can also come from the FIP effect provided it exists in the chromosphere above sunspot umbra. Theoretical and observed values of I(K_1)/I(H_1) and I(K_3)/I(H_3) are compared. It is shown that for one of the sunspots we observed, the values obtained for the ratio I(K_1)/I(H_1) cannot be explained in terms of existing umbra models.
Related content
Access to resources
Recommend
H I observations of flat galaxies
By Mitronova S. Huchtmeier W. Karachentsev I. Karachentseva V. Kudrya Yu.
Astronomy Letters, Vol. 31, Iss. 8, 2005-08 ,pp. :
By Urquhart J. S. Hoare M. G. Lumsden S. L. Oudmaijer R. D. Moore T. J. T. Mottram J. C. Cooper H. D. B. Mottram M. Rogers H. C.
Monthly Notices of the Royal Astronomical Society, Vol. 420, Iss. 2, 2012-02 ,pp. :
The Origin of the H I Holes in the Interstellar Medium of Holmberg II
By Dib Sami
Astrophysics and Space Science, Vol. 292, Iss. 1-4, 2004-08 ,pp. :
By Serra Paolo Oosterloo Tom Morganti Raffaella Alatalo Katherine Blitz Leo Bois Maxime Bournaud Frédéric Bureau Martin Cappellari Michele Crocker Alison F. Davies Roger L. Davis Timothy A. de Zeeuw P. T. Duc Pierre-Alain Emsellem Eric Khochfar Sadegh Krajnović Davor Kuntschner Harald Lablanche Pierre-Yves McDermid Richard M. Naab Thorsten Sarzi Marc Scott Nicholas Trager Scott C. Weijmans Anne-Marie Young Lisa M.
Monthly Notices of the Royal Astronomical Society, Vol. 422, Iss. 3, 2012-05 ,pp. :