Table 1 Measured shift velocity and sweeping velocity in comparison to the theoretical estimate for the ion bulk speed, Alfvén speed, and sound speed using the mean values of plasma and magnetic field data
Streamwise wavenumber \(k_{\mathrm{s}}\) (rad/km) | Shift velocity measurement \(U_{\mathrm{sft}} \pm \Delta U_{\mathrm{sft}}\) (km/s) | Ion bulk speed with Alfvén speed \(U_{\mathrm{flow}} \pm V_{\mathrm{A}}\) ( km/s) | |
|---|---|---|---|
\(1.0\times 10^{-3}\) | \(396\pm 17\) | ||
\(1.5\times 10^{-3}\) | \(423\pm 17\) | \(443\pm 54\) | |
\(2.0\times 10^{-3}\) | \(401\pm 15\) | ||
Streamwise wavenumber \(k_{\mathrm{s}}\)(rad/km) | Sweeping velocity measurement \(U_{\mathrm{swp}} \pm \Delta U_{\mathrm{swp}}\) (km/s) | Alfvén speed \(V_{\mathrm{A}}\) (km/s ) | Sound speed \(c_{\mathrm{s}}\) (km/s) |
|---|---|---|---|
\(1.0\times 10^{-3}\) | \(82\pm 12\) | ||
\(1.5\times 10^{-3}\) | \(85\pm 13\) | 54 | 56 |
\(2.0\times 10^{-3}\) | \(76\pm 11\) |