Physics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..153..419h&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 153, no. 1-2, p. 419-435
Physics
7
Chromosphere, Helium, Interplanetary Space, Line Spectra, Photosphere, Plasma Acceleration, Scintillation, Solar Corona, Solar Magnetic Field, Solar Wind Velocity, Solar Radio Emission, Statistical Correlation
Scientific paper
Solar wind speeds (SWSs) estimated by interplanetary scintillation (IPS) observations during Carrington rotation 1753 are projected onto the so-called `source-surface' of 2.5 solar radii along magnetic field lines in interplanetary space. The following two working hypotheses are examined from different points of view: (1) The SWS is a weighted mean along the line of sight to a radio source; the weight for the SWS depends on the distance from the P-point, the closest approach to the Sun on the line of sight. (2) The weighting function has a very sharp peak at the P-point, so that the SWS shows a real solar wind speed at the P-point. In both the two cases, the SWSs projected onto the source are further projected onto the photosphere along magnetic field lines in the corona. Footpoints of these lines are inferred as photospheric source regions of the solar wind. The intensity of the He I (1083 nm) absorption line (HEI) in the chromosphere corresponding to these photospheric sources is interpolated from observational data. The weighted mean of the HEI is calculated in case 1. The HEI corresponding to the P-point is used in case 2. The SWS is compared with the HEI in both the two cases. It is found that the correlation between the SWS and the HEI is better in case 2 than in case 1. It is further inferred by correlation analysis between the SWS and the HEI that the solar wind is accelerated within approximately 27 solar radii on average. Although the data examined in this paper were limited to just one solar rotation, these results suggest that the SWS estimated by the IPS technique corresponds to the solar wind speed near the P-point and the weighing function along the line of sight may have a very sharp peak near the P-point.
Hakamada Kazuyuki
Kojima Masayoshi
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