EVIDENCE OF EXPLOSIVE EVAPORATION IN A MICROFLARE OBSERVED BY HINODE/EIS

Journal Article · Sat Nov 20 04:00:00 EST 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/724/1/640· OSTI ID:21471183

Chen, F

We present a detailed study of explosive chromospheric evaporation during a microflare which occurred on 2007 December 7 as observed with the Extreme-ultraviolet Imaging Spectrometer on board Hinode. We find temperature-dependent upflows for lines formed from 1.0 to 2.5 MK and downflows for lines formed from 0.05 to 0.63 MK in the impulsive phase of the flare. Both the line intensity and the nonthermal line width appear enhanced in most of the lines and are temporally correlated with the evaporation velocity. Our results are consistent with the numerical simulations of flare models, which take into account a strong nonthermal electron beam in producing the explosive chromospheric evaporation. The explosive evaporation observed in this microflare implies that the same dynamic processes may exist in events with very different magnitudes.

• OSTI ID: 21471183
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 724; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BEAMS
COMPUTERIZED SIMULATION
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
EVAPORATION
EXTREME ULTRAVIOLET RADIATION
LEPTON BEAMS
LINE WIDTHS
MAIN SEQUENCE STARS
MEASURING INSTRUMENTS
PARTICLE BEAMS
PHASE TRANSFORMATIONS
RADIATIONS
SIMULATION
SOLAR ACTIVITY
SOLAR FLARES
SPECTROMETERS
STARS
STELLAR ACTIVITY
STELLAR FLARES
SUN
TEMPERATURE DEPENDENCE
ULTRAVIOLET RADIATION