FORWARD MODELING CAVITY DENSITY: A MULTI-INSTRUMENT DIAGNOSTIC

Journal Article · Fri May 20 00:00:00 EDT 2011 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/733/1/1· OSTI ID:21576815

Schmit, D J ^[1]; Gibson, S E ^[2]

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1. Department of Astrophysical and Planetary Science, University of Colorado, Boulder, CO 80305 (United States)
2. High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO 80307 (United States)

The thermodynamic properties of coronal prominence cavities present a unique probe into the energy and mass budget of prominences. Using a three-dimensional morphological model, we forward model the polarization brightness and extreme-ultraviolet (EUV) emission of a cavity and its surrounding streamer. Using a genetic algorithm, we find the best-fit density model by comparing the models to Mauna Loa Solar Observatory MK4 and Hinode EUV Imaging Spectrometer data. The effect of temperature variations on the derived density is also measured. We have measured the density inside a cavity down to 1.05 R{sub sun} with height-dependent error bars. Our forward modeling technique compensates for optically thin projection effects. This method provides a complementary technique to traditional line ratio diagnostics that is useful for diffuse off-limb coronal structures.

• OSTI ID: 21576815
• Journal Information: Astrophysical Journal, Vol. 733, Issue 1; Other Information: DOI: 10.1088/0004-637X/733/1/1; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
BRIGHTNESS
CAVITIES
DENSITY
EMISSION
EXTREME ULTRAVIOLET RADIATION
POLARIZATION
SIMULATION
SOLAR CORONA
SOLAR PROMINENCES
THERMODYNAMIC PROPERTIES
THREE-DIMENSIONAL CALCULATIONS
ATMOSPHERES
ELECTROMAGNETIC RADIATION
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
SOLAR ACTIVITY
SOLAR ATMOSPHERE
STELLAR ACTIVITY
STELLAR ATMOSPHERES
STELLAR CORONAE
ULTRAVIOLET RADIATION