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The extended minimum of Solar Cycle 23, the extremely quiet solar-windconditions prevailing, and the mini-maximum of Solar Cycle 24 drew globalattention and many authors have since attempted to predict the amplitude of theupcoming Solar Cycle 25, which is predicted to be the third successive weakcycle; it is a unique opportunity to probe the Sun during such quiet periods.Earlier work has established a steady decline, over two decades, in solarphotospheric fields at latitudes above $45^{\circ}$ and a similar decline insolar-wind micro-turbulence levels as measured by interplanetary scintillation(IPS) observations. However, the relation between the photospheric magneticfields and those in the low corona/solar-wind are not straightforward.Therefore, in the present article, we have used potential-field source-surface(PFSS) extrapolations to deduce global magnetic-fields using synopticmagnetograms observed with National Solar Observatory (NSO), Kitt Peak, USA(NSO/KP) and Solar Optical Long-term Investigation of the Sun (NSO/SOLIS)instruments during 1975-2018. Furthermore, we have measured the normalizedscintillation index [m] using the IPS observations carried out at the Instituteof Space Earth Environment Research (ISEE), Japan during 1983-2017. From theseobservations, we have found that, since the mid-1990s, the magnetic-field overdifferent latitudes at 2.5 $\rm R_{\odot}$ and 10 $\rm R_{\odot}$(extrapolatedusing PFSS method) has decreased by $\approx 11.3-22.2 \%$. In phase with thedeclining magnetic-fields, the quantity m also declined by $\approx 23.6 \%$.These observations emphasize the inter-relationship between the globalmagnetic-field and various turbulence parameters in the solar corona and solarwind.

Global Solar Magnetic-field and Interplanetary Scintillations During the Past Four Solar Cycles