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Hui Li   Submitted: 2003-06-02 21:56

After carefully comparing the white-light (lambda 5600 ±800 A) and the slit-jaw Hα images (0.5 A passband) of the 2N/X20 white-light flare of 16 August 1989, we found that the Hα counterpart identification of the bright kernels in continuum by Hiei et al. (1992) was incorrect. Now we come to the conclusion that both of those two white-light kernels do not have corresponding bright Hα area. Moreover, the loop shapes in white-light are also different from those in Hα . Hα loops rose more rapidly than white-light loops. However, their height-time variations on the whole are similar. This indicates that the continuum and chromospheric emissions of the flare presumably come from different plasmas, but may be modulated by some mutual factors, such as large-scale magnetic fields. Analysis of the HeI 10830 spectra taken simultaneously with the slit-jaw Hα images shows that the line-center intensity of HeI 10830 doesn't have a good correlation with the intensity of nearby continuum, which supports the above conclusions. In addition, the electron density at the white-light loop top estimated from the continuum around lambda 5600A~ and lambda 10830A is as high as 1012-1013/cm^3.

Authors: Jianqi You, Eijiro Hiei and Hui Li
Projects: None

Publication Status: Solar Physics (submitted)
Last Modified: 2003-06-02 21:56
Go to main E-Print page  Directionality of Flare-Accelerated Alpha Particles at the Sun  TRACE and YOHKOH Observations of a White Light Flare  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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