  The purpose of this work is to draw attention of readers to a problem of
possible differences in generation of magnetic storms induced by various large
scale solar wind (SW) streams: CIR, Sheath and ICME (including MC and Ejecta).
Recently we showed that when using a modification of formula by Burton et al.
[1975] for connection of interplanetary conditions with Dst and Dst* indices
the efficiency of storm generation by Sheath and CIR is about 50 percent higher
than generation by ICME [Nikolaeva et al., 2013, 2015]. In the literature there
are many various functions coupling (FC) various interplanetary parameters with
magnetospheric state. In this work we study the efficiency of main phase storm
generation by different SW streams when using 12 another FCs on the basis of
OMNI data during 1976 ... 2000. Obtained results show that for most part of FCs
Sheaths have the highest efficiency and MCs have the lowest efficiency in
accordance with our previous results. The reliability of the obtained data and
possible reasons of divergences for various FCs and various SW types require
further researches.
