Reconciliation of the Coronal Heating Function between Yohkoh and TRACE

Details Reconciliation of the Coronal Heating Function between Yohkoh and TRACE Reconciliation of the Coronal Heating Function between Yohkoh and TRACE

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf...57a&link_type=abstract

Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc

Physics

Scientific paper

Mixed results on the determination of the coronal heating function are quoted in literature. There seems to be a polarization between Yohkoh, SoHO/EIT, and TRACE results. Essentially, heating functions EH(s) derived from the temperature-broadband instrument SXT/Yohkoh yield best fits for uniform or looptop heating (Priest et al. 1998, 2000; Wheatland, Sturrock, & Acton 1997), while the same heating function derived from temperature-narrowband instruments like EIT and TRACE yield best fits for footpoint heating with scale heights of sH l ≅15 Mm. The problem seems to be rooted in oversimplified modeling of filter-ratio temperatures, using single-temperature models for every line-of-sight, although the broadband response of Yohkoh/SXT is sensitive to emission measure-weighted temperatures of the entire dEM(T)/dT distribution above T > 1.5 MK. We revisit previous analyses of Yohkoh data and demonstrate with forward-fitting methods of multi-temperature models or continuous dEM(T)/dT distributions that both the Yohkoh/SXT and TRACE data can be reconciled, both yielding coronal heating function with scale heights of sH lapprox 15 Mm, for active region loops as well as for quiet Sun region. This result has important consequences for the identification of the long-sought physical mechanisms responsible for coronal heating.

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