We have noticed that the table 1 had some errors on its last three columns. Now the corrected values are given in the table.
Table 1. Comparison between the thermal and phase velocity for the chosen parameters.
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20190208052003387-0985:S0022377819000047:S0022377819000047_tab1.gif?pub-status=live)
The first line of p. 7 is corrected as ‘we have assumed that the plasma contains both
$H^{+}$
and
$O^{+}$
, the former being the cooler component with
$\unicode[STIX]{x1D707}_{i}=0.4$
’.