Journal
SOLAR PHYSICS
Volume 269, Issue 2, Pages 295-307Publisher
SPRINGER
DOI: 10.1007/s11207-010-9702-5
Keywords
Heating, coronal; Flares, microflares and nanoflares; Spectral line, intensity and diagnostics
Categories
Funding
- NSF, Hungary [K67746]
- STFC [ST/H000429/1, PP/D002907/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/D002907/1, ST/H000429/1] Funding Source: researchfish
- UK Space Agency [ST/J001732/1] Funding Source: researchfish
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It has been established that small scale heating events, known as nanoflares, are important for solar coronal heating if the power-law distribution of their energies has a slope alpha steeper than -2 (alpha < -2). Forward modeling of impulsively heated coronal loops with a set of prescribed power-law indices alpha is performed. The power-law distribution is incorporated into the governing equations of motion through an impulsive heating term. The results are converted into synthetic Hinode/EIS observations in the 40 '' imaging mode, using a selection of spectral lines formed at various temperatures. It is shown that the intensities of the emission lines and their standard deviations are sensitive to changes in alpha. A method based on a combination of observations and forward modeling is proposed for determining whether the heating in a particular case is due to small or large scale events. The method is extended and applied to a loop structure that consists of multiple strands.
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