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Emission Measures Demystified

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arxiv 2403.14845 v1 pith:COEJKLEX submitted 2024-03-21 astro-ph.SR

classification astro-ph.SR
keywords emissiondifferentspectrachianticolumnmeasuremeasuresobservations
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We review the terms, spectral radiance and spectral irradiance, and show how their precise definitions are crucial for interpreting observations made with different instruments covering widely different energy or wavelength ranges. We show how the use of column and volume emission measures in different solar physics and astrophysics communities has led to confusion in relating measured extreme ultraviolet and soft X-ray spectra with theoretical spectra generated, in particular, using CHIANTI. We describe a method for obtaining spatially integrated X-ray line and continuum spectra using CHIANTI that requires a column emission measure when only the plasma temperature and volume emission measure, but not the source area, are known from observations.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. A Diagnostic Kit for Optical Emission Lines Shaped by Accretion Disc Winds

    astro-ph.IM 2025-09 conditional novelty 6.0 of 10

    Wind-formed CV H-alpha profiles can populate the expected outflow region of the excess-EW diagram, but the diagram is so sensitive to wing definition that an FWHM-based mask and a calibrated EW scaling relation are proposed.

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