tokens: = 3.5 − 750 are displayed in Figs 14 (a, b). From Fig. 14(a) , it looks, as if, the acoustic modes are divided into two groups as follows. The first group of waves, which looks dispersive in nature, is localized in the domain, k = 10 −4 − 6 (). The phase velocity of this group increases radially outwards and acquires supersonic value with sub-sonic transition beyond about k = 6. The second group of waves, which is almost non-dispersive in nature within a wide-range of the ξ-space, is localized in a wide-range of k -domain [Fig. 14(a) and Fig. 15(a) ]. The propensity of weak dispersion is reflected near the SSB. These waves are found to travel within sub-sonic range of flow speed. From Fig. 14(b) , it is clear that the group velocity is almost constant in the k -space. Moreover, no distinction is noted between the two groups. However, the group velocity increases radially outwards with the asymptotic sonic speed value at 1 au. In Fig. 14(c) , we depict the time period plot in the k - and ξ-spaces. The categorization of the two distinct groups of waves is clearly visible. The time periods of the dispersive mode group are found to be larger than those of the non-dispersive wave group, but at different ξ. It also reveals that discreteness in the low k -value of the fluctuations results in discreteness in the oscillation period peaks. In the range of relatively high k -value and beyond, such discrete peaks in the oscillation period are not observed. In Figs 15 (a, b, c), we depict the phase velocity, group velocity and time period in the extended k -space. Also, the time period decreases towards shorter wavelength. Figs 16 (a, b) depict that the electrostatic potential fluctuation level, being higher, dominates over the SWP flow fluctuations. One more thing, to say, is that the amplitude profile of the flow fluctuations is the same as that of the SIP. Finally, Figs 17 (a, b) show the SWP fluctuation parameters [ and ] in the extended k -space. The electrostatic potential fluctuations increase towards the shorter wavelength regime. The flow fluctuations are not affected much in the shorter wavelengths. This is in conformity with the flow-pattern phenomena as observed in the SIP as well. Some specific features in addition, are enlisted as below. The phase velocity of the non-dispersive p-modes, as identified and discussed above in Figs 14(a) and 15(a) , varies in the sub-sonic range only. But, that of the dispersive branch of the p-modes, varies from sub-sonic to supersonic regime with maximum v p ∼ 200 km s −1 at 1 au. The phase velocity plot in the extended k -domain [Fig. 15(a) ] exhibits a similar type of behaviour of sub-sonic and supersonic speeds. The corresponding group velocity [Fig. 14(b) and Fig. 15(b) ] acquires sonic speed, v g ≈ 100 km s −1 , at 1 au in all the k -domains. The time period plots [Fig. 14(c) and Fig. 15(c) ] exhibit strong radial dependence with two distinct peaks, τ ≈ 20 min each, lying at ξ ≈ 30 ( away from the SSB) and
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