Observational Signatures of Impulsively Heated Coronal Loops: Power-Law Distribution of Energies

Authors Organisations
Type Article
Original languageEnglish
Pages (from-to)295-307
Number of pages13
JournalSolar Physics
Volume269
Issue number2
DOI
Publication statusPublished - Apr 2011
Links
Permanent link
View graph of relations
Citation formats

Abstract

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 α steeper than −2 (α<−2). Forward modeling of impulsively heated coronal loops with a set of prescribed power-law indices α 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 α. 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.