The first results of SOHO's JOP 40 are presented. This program proposes to study the chromospheric to transition region of equatorial coronal holes in order to derive parameters such as the temperature, the density, using different lines formed at different altitudes, in different places: the boundary of a coronal hole or the central region, on the disk. The two components of the chromospheric quiet Sun, network and internetwork, should be observed, in and out of an equatorial coronal hole.
IAU Joint Discussion
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