1. The detedction of photospheric impacts from chromospheric impulsive events Moretti,P.F. et al.,2003,ApJL,589,109
Short review
神尾 精

2. Abstract
Perturbation of photosphere caused by chromospheric impulsive downflow is detected.
Although it is generally accepted that convective flow is the source of solar oscillation, the downflow events may be the origin of solar oscillation.

3. Instrument Italian Panoramic Monochrometer (IPM) installed in THEMIS.
Birefringent ＋ Fabry Perot Filters
Cd isotope for wavelength reference
 Precision of about 10 m/s (～2mÅ)
Wavelength range 4600Å～6800Å

4. Observation B class flare in AR 9455 at 10:00UT on 2001 May 13
Images of 11 wavelengths were obtained each 40s.
Fe I
5576.1Å
0, ±45, ±80 mÅ
Na I Å
0, ±80 mÅ Hα
6562.8Å
0, ±650 mÅ
Dopplergrams were obtained by fitting FeI images with Gaussian profile

5. Hα and acceleration map
Trigger Area(TRA)
First Brightening
Area(FBA)
Hα line core image
Acceleration map of FeI
Strong acceleration is detected in FBA and TRA

6. Time plot Flare started at 09:58 UT Impulsive down flow at 10:10 UT
wing
core

7. Velocity and FWHM of FeI
09:40 FWHM increase
09:52 Upflow in TRA
09:58 Flare start in FBA(Hα)
10:10 Downward pulse

8. Discussion
Downward flows in the photosphere are detected during a B-class flare.
Upward flow seems to be related to the trigger of the flare.
Kinetic energy released by the downflow jet is approximately 5x1026 erg. These events are the part of the source of solar oscillation.