THE SOUTHERN HIGH-SPEED STREAM - RESULTS FROM THE SWICS INSTRUMENT ONULYSSES

The high-speed solar wind streaming from the southern coronal hole was remarkably uniform and steady and was confined by a sharp boundary th at extended to the corona and chromosphere. Charge state measurements indicate that the electron temperature in this coronal hole reached a maximum;of about 1.5 million kelvin within 3 solar radii of the sun. T his result, combined with the observed lack of depletion of heavy elem ents, suggests that an additional source of momentum is required to ac celerate the polar wind.