HeI10830暗点的观测

OBSERVATION OF HeI 10830 DARK POINTS

ＨｅＩ１０８３０暗点的观测黎辉，樊忠玉，尤建圻（中国科学院紫金山天文台南京２１０００８）关键词两维光谱，ＨｅＩ１０８３０暗点，速度场自七十年代中期，Ｈａｒｖｅｙ等发现从太阳的Ｈｅｌ１０８３０单色象上可以辨认出通常只能在Ｘ射线单色象上才能看到的冕洞后，...

We obtained a batch of 2-dimensional Hel 10830 spectra of solar polar areas with our imaging spectrograph at Purple Mountain Observatory. Preliminary analysis shows that some Hel 10830 'dark points' and coronal hole were recorded' This is for the first time,we believe, that the velocities of 'dark points' were directly measured.In this paper,the observations of May 8, 1995,is briefly described. It is found that in the Hel 10830 spectroheliograms there exist dark structures on a scale of 10″-20″ whose absorption depths are 10%-20%. The morphology of those dark structures and their absorption depths vary obviously at a time scale of 40 minutes with the intensity amplitude variation of 30%-100%. On the velocity image deduced from two off-band Hel 10830±0.14A images,blueshifts are remarkably seen in those dark points. The blue-shifted velocities of those Hel 10830 dark points, derived from their spectral profiles, are 5-17 km/sec.At the same time,no intensity depression of dark structure,such as pores is detected on the simultaneously observed images at continuum. We also notice that in some local regions, the Hel 10830 absorption obviously decreases and the chromospheric networks are relatively nuclear,indicating the regions are coronal holes.