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Title: Nomogram for sunspot numbers
Authors: Upreti, U C
Issue Date: Dec-1997
Publisher: NISCAIR-CSIR, India
Abstract: Nomogram construction using the parabolic relationship f0F2=a0+a1R12+a2R212 between monthly median f0F2 and running average sunspot number (RASSN) R12 values has been described; here a0, a1 and a2 are the best fit coefficients. The nomogram can give required local effective sunspot number (LESSN) values corresponding to any observed value of f0F2. Transforming the f0F2-RASSN relation to the form R212+pR12+q=0 [where p=a1/a2 and q=(a0- f0F2/a2), a practical method for the preparation of a single nomogram for f0F2-RASSN has been described and the problem of very high and very low values of the variables has also been dealt with successfully. A single nomogram for large range of variables, namely, f0F2, a0, a1 and a2 has been obtained so that one easily find LESSN values at any location, season, and time. The nomogram tends to minimize the errors in LESSN calculations at all levels of solar activity.
Page(s): 346-353
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.26(6) [December 1997]

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