Article

The investigation of the Neupert effect in two solar flares

Science in China Series G Physics Mechanics and Astronomy (impact factor: 1.41). 04/2012; 52(11):1686-1690. DOI:10.1007/s11433-009-0219-6 pp.1686-1690

ABSTRACT The Neupert effect suggests a flare model in which the nonthermal emissions are produced by energetic electrons which heat
lower corona and chromosphere to produce the thermal emissions. Based on this concept, we investigate the Neupert effect to
test the correlation between the hard X-ray spectral index and the time rate of the UV flare area at 1600 or 171 Å. Using
the TRACE and RHESSI observations, we explore these quantities for two solar flares, one on March 14, 2002 and the other on November 1, 2003.
The negative dependence between the spectral index and the time rate of the UV flare area is found, especially during the
hard X-ray sub-peaks. This finding indicates that the electron-beam-driven heating plays a prominent role in the UV emission
of these two flares.

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Keywords

electron-beam-driven heating
 
energetic electrons
 
negative dependence
 
Neupert effect
 
nonthermal emissions
 
November 1
 
quantities
 
RHESSI observations
 
solar flares
 
spectral index
 
thermal emissions
 
UV flare area
 
X-ray spectral index
 

Zongjun Ning