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Effect of Flow-Tube Geometry on Solar Wind Properties

Chen, Y.; Hu, Y. Q.

A mathematical description of the solar wind flow-tube geometry is proposed. The expansion factor of the flow tube f(r) (=a/r², r is the heliocentric distance and a is the flow-tube cross-section area)increases monotonically from 1 at the coronal base to _m at r_c, and approaches its asymptotic value f_∞ ne…

Transition region and coronal plasmas: instrumentation and spectral analysis

Dammasch, Ingolf E.; Wilhelm, Klaus; Hassler, Donald M.

The plasma conditions in the solar atmosphere and, in particular, in coronal holes are summarized, before space-borne instrumentation for observing these regions in vacuum-ultraviolet light is briefly introduced with the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer on the Solar and Heliospheric Observatory (SOHO) as exa…

SOHO, Yohkoh, Ulysses and Trace: The four solar missions in perspective, and available resources

Domingo, V.

Four solar observing spacecraft, now in operation, have obtained and continue to obtain data during the late phase of solar cycle 22 and hopefully most of cycle 23. The data are available for scientific analysis, practically in an unrestricted manner. A large pool of software suited for the processing and to help programming any data analysis is f…