The H-alpha radial velocities of an arch filament system in solar emerging flux region

The H-alpha radial velocities ofThe H-alpha radial velocities of an arch filament system an arch filament system

in solar emerging flux regionin solar emerging flux region

Shino Kawahara Shino Kawahara

Rakutou High School Rakutou High School

KYOTOKYOTO

On emerging flux regionOn emerging flux region 　　 ::　　EFREFR

In H-alpha images, we can observe black bands between In H-alpha images, we can observe black bands between sun spots pair in early stage.sun spots pair in early stage.

It is believed that these black bands are emerging flux It is believed that these black bands are emerging flux tubes.tubes.

These tubes were These tubes were

made in convection zonemade in convection zone in solar interior, in solar interior,

and rose to the surface.and rose to the surface. These areas are called These areas are called

as emerging flux region as emerging flux region (EFR) ,(EFR) ,

and black bands and black bands

as arch filament system as arch filament system (AFS).(AFS).

It is believeIt is believedd that there are flux that there are flux tubes tubes which which move upward about 10km/s at the centermove upward about 10km/s at the center, and th, and the e downdownward moving ofward moving of about about 30km/s to 50km/s30km/s to 50km/s at both ends of the arch.at both ends of the arch.

Then we examined distributions of velocity in AThen we examined distributions of velocity in AFS by means of Doppler shift measurements of FS by means of Doppler shift measurements of H-alpha lines.H-alpha lines.

Observation and AnalysisObservation and Analysis Using the 70cm coelostat telescope and the high dispersion Using the 70cm coelostat telescope and the high dispersion

spectrogram, we observed the solar surface phenomena atspectrogram, we observed the solar surface phenomena at　　 Kwasan observatory on 10th and 11th of Aug. in 2006.Kwasan observatory on 10th and 11th of Aug. in 2006.

We observed sunspots group We observed sunspots group NOAA0904NOAA0904.. We performed Doppler shift measurements of H-alpha lines We performed Doppler shift measurements of H-alpha lines of each AFS’s.of each AFS’s. We derived the radial velocities of each AFS’s from followWe derived the radial velocities of each AFS’s from follow

ing formula ing formula 　　　　　　　　 Δλ/λΔλ/λ ＝＝ V/cV/c (Δλ: Doppler shift of H-alpha line center, (Δλ: Doppler shift of H-alpha line center, λ: H-alpha wave length, V: radial velocity, c: velocity of light)λ: H-alpha wave length, V: radial velocity, c: velocity of light)

Observing time of both figures is 2:25 on the 10Observing time of both figures is 2:25 on the 10th th of Aug. in 2006(UT) of Aug. in 2006(UT)

Fig.1 The spectral image of sun spotsNOAA0904 (left),Fig.1 The spectral image of sun spotsNOAA0904 (left),

H-alpha image ofH-alpha image of the slit mirror of the spectrogramthe slit mirror of the spectrogram

（（ rightright ））

Blue　　　　　　　　　　　　　　　　　　　　　 Red

Fig.2 The spectral trace was made from Fig1.Fig.2 The spectral trace was made from Fig1.

0 500 100010000

20000

30000

40000

50000

H2O 6561.097

H-α中心 6562.808

H2O6564.206

短波長側(青)　 　波長（ピクセル単位） 長波長側(赤)

相対

強度

Relative intensity

H-α center

Shortward (blue) Longward (red)Wavelength (in pixel units)

The three radial velocity observations obtained The three radial velocity observations obtained between 2:25 to 2:40 10th of Aug. show;between 2:25 to 2:40 10th of Aug. show;

　　　　　　 The eastwardThe eastward ；； No observation.No observation. 　　　　　　　　　　　　 The centerThe center ；； -14.5km/s-14.5km/s 、、 -15.4km/s-15.4km/s

　　　　　　 The westwardThe westward ；； +0.7km/s+0.7km/s The mean radial velocities from 12 observations The mean radial velocities from 12 observations

obtained between 0:42 to 1:56 11th of Aug. show ;obtained between 0:42 to 1:56 11th of Aug. show ;

　　　　　　 The eastwardThe eastward ；； +2.1km/s+2.1km/s (±1.13km/s (±1.13km/s ）、）、　　　　　　 The centerThe center ；； -13.1km/s-13.1km/s(±2.8km/s(±2.8km/s ）、）、　　　　　　 The westwardThe westward ；； -0.5km/s-0.5km/s

ResultsResults

The radial velocities of upward flux of central region The radial velocities of upward flux of central region are observed higher values among three regions.are observed higher values among three regions.The other hand, the radial velocities of downward The other hand, the radial velocities of downward flux of each ends are observed not so high.flux of each ends are observed not so high.　

Results Results ２２The solar surface

Mean value

＋ 2.1km/s

Line of sight

Sun spots

Mean value － 0.5km/s

Mean value － 13.1km/s

AFS

AcknowledgmentAcknowledgment

We thank Drs. Shibata, Kurokawa and IshiWe thank Drs. Shibata, Kurokawa and Ishii,i,

and staffs of Kwasan observatory.and staffs of Kwasan observatory.

This work was supported by SPP/JST (2006).This work was supported by SPP/JST (2006).