Nonthermal Velocity and Differential Emission Measure at Preflare Site using Hinode EIS

Details Nonthermal Velocity and Differential Emission Measure at Preflare Site using Hinode EIS Nonthermal Velocity and Differential Emission Measure at Preflare Site using Hinode EIS

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1907k&link_type=abstract

American Astronomical Society, SPD meeting #40, #19.07; Bulletin of the American Astronomical Society, Vol. 41, p.847

Astronomy and Astrophysics

Astronomy

Scientific paper

We have made an imaging spectroscopic study at the preflare site, which is associated with a C4.2 flare that occurred on 2007 January 16 using Hinode EUV Imaging Spectrometer (EIS) data. Examining many spectral lines of EIS, we determined intensities, Doppler velocities, and nonthermal velocities at the preflare site, which is cospatial with the place where the flare occurred, as well as at a nearby quiet loop. Also we derived the differential emission measure (DEM) for each region using the intensity at several wavelengths and the density obtained by the filter ratio (Fe XII λ186.88/λ195.12) method. A comparison of nonthermal velocities and DEM at both regions reveals several interesting characteristics of the preflare site as follows. First, the nonthermal velocities at the preflare site are noticeably higher than that at the quiet loop for all wavelengths. Second, the difference of the nonthermal velocities at between the preflare site and the quite loop has a maximum value at the lowest temperature, log T = 5.8. Third, while the DEM curve for the quiet loop is broad over coronal temperatures, that for the preflare site shows double peaks near log T = 6.4 and log T = 5.3. These results imply that there should be strong nonthermal motions and hot components at the lower temperature atmosphere just before the preflare time. Regarding hot components, we suggest two possibilities: the activity of multi-thermal loops or lower atmospheric heating caused by small-scale magnetic reconnection process.

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