Testing Nanoflare Heating in Coronal Loops With Observations From the Extreme Ultraviolet Imaging Spectrometer On-board the SOLAR-B Mission

Details Testing Nanoflare Heating in Coronal Loops With Observations From the Extreme Ultraviolet Imaging Spectrometer On-board the SOLAR-B Mission Testing Nanoflare Heating in Coronal Loops With Observations From the Extreme Ultraviolet Imaging Spectrometer On-board the SOLAR-B Mission

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0124p&link_type=abstract

American Astronomical Society, SPD meeting #37, #1.24; Bulletin of the American Astronomical Society, Vol. 38, p.219

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A number of theoretical and observational considerations suggest that coronal loops are bundles of unresolved, impulsively heated strands. This "nanoflare" model, as it is sometimes called, predicts high-speed evaporative upflows, which might be revealed as non-thermal broadening of spectral line profiles. We have therefore generated synthetic line profile observations based on 1D hydrodynamic simulations of nanoflare heated loop bundles.We will show that hot lines (T>5MK) hold the imprints of the heating process via the development of distinct enhancements in the line wings. These signatures do not appear in the profiles of cooler lines, which is fully consistent with existing observations. We will demonstrate how the spectra of hot lines from the Extreme Ultraviolet Imaging Spectrometer (EIS) on-board the upcoming SOLAR-B mission can be used to test the basic nanoflare picture and perhaps even to pinpoint the properties of the nanoflares, such as their energy content, duration, and spatial dependence. We will present sample observing programs for studying nanoflare heating in coronal loops that utilize EIS and other instrumentation on-board SOLAR-B and STEREO.Research supported by NASA and ONR.

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