Comparing ULYSSES wind speed with coronal flux-tube expansion factor

Details Comparing ULYSSES wind speed with coronal flux-tube expansion factor Comparing ULYSSES wind speed with coronal flux-tube expansion factor

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.confr..63s&link_type=abstract

International Solar Wind 8 Conference, p. 63

Computer Science

Solar Wind, Solar Wind Velocity, Velocity Measurement, Solar Corona, Magnetic Flux, Ulysses Mission, Wind Measurement, Interplanetary Space, Solar Magnetic Field, Photosphere, Ecliptic, Calibrating

Scientific paper

We have been comparing measurements of solar wind speed at the Ulysses spacecraft with coronal flux-tube expansion rates, derived from photospheric field measurements using a current-free coronal model. The large-scale patterns of derived speed have continued to reproduce the observed patterns from launch through south polar passage to the present 40S latitude of the spacecraft. The fastest non-transient wind speeds of approx. 860 km/s were encountered at midlatitudes en route to the south pole, rather than during polar passage when the peak speeds were approx. 820 km/s. Although this result is in qualitative agreement with the idea that the wind speed is controlled by the coronal flux-tube expansion rate, the 40 km/s difference is significantly smaller than the 100-150 km/s difference based on our in-ecliptic calibration. This paper will summarize our attempts to resolve this discrepancy and will show the observational status of our coronal/interplanetary comparison at the time of the meeting.

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