Abstracts 131

was in error by one hour. On the basis of these observations we tentatively explore the long-term tendency of the Earth’s rotation. (AAnS, 1995, 36, 214-320)

Analysis of the algorithms sued in Dai nationality calendar HE Yu-NAN Purple Mountain Observatory, Nonjing 210008

In this paper I analyze certain basic algorithms used in Dai calendar to convert the calendar date to the day number reckoned from the Dai calendar epoch. I also give a correct formula for counting the number of intercalary months. A computer program is written incorporating the algorithms and an Ephemeris for Dai Years 1283-1402 (AD 1921-2040) is g enerated. A new point of view is presented on the comparison of month orders in the Dai and traditional Chinese calendars. (AAnS, 1995, 36, 321-330)

Clumping in the giant molecular cloud complex Cepheus OB 3 YU ZHI-YAO, TOM00 NAGAI&MA & YASUO F~KUI Shanghai Observatory, Shanghai 200030

The Nagoya University mm-wave telescope is used to observe the complex in the C”O (J=l-0) line. Physical parameters of Cores B and F are obtained. There is evidence of clumping in the giant cloud and the whole complex is unbounded. (AAnS, 1995, 36, 33734)

Contribution by inverse Compton scattering to the diffuse gamma-rays in medium latitudes ZHANG LI Deportment of Physics, Yunnon University

Recent EGRET data are used in the calculation of the contribution. Two methods are used. In a new method, the r-ray emissivity produced by the interaction between cosmic rays and interstellar gas is determined by the y-ray data themselves, in the method used before, it is given by theoretical estimation. The results indicate that the contribution by inverse Compton scattering is quite appreciable. (AApS, 1995, 15, 344-349)

Computing the global coronal magnetic Aeld: a comparison between the boundary element and multiple expansion methods WANG DONG, WEI FENG-SI & YAN YI-HUA Center for space Science ond Applied Research, Beijing 100080

In this paper we calculated the global coronal (at 2.5 Ro) magnetic field in Carrington rotations 1733-1742 using the boundary element method, under the linear force-free field model, based on photospheric magnetic field observations. The results are compared with those using the multiple expansion method under the potential field model. The two approaches give similar large-scale configurations, numerical differences apart. For some Carrington rotations, the magnetic neutral lines were somewhat different. Neither method give the small- and medium-scale field structures at the photospheric level and observed by spacecraft. The necessity of developing a better algorithm for calculating the coronal field is pointed out and some attendant problems outlined. (AApS, 1995, 15, 359-364)

The multi-cloud model and its application to the study of asymmetrical line proflles GU XIAO-MA, LI KE-JUN & LIN JON Yunnon Observatory, Kunming 650011

We propose a multi-cloud model for treating asymmetrical lines generated by discrete active bodies on the Sun. Several applications are given. The a-cloud model is found adequate in many cases. (AApS, 1995, 15, 365-372)

* A statistical comparison between the Miyun 232 MHz and the 6C catalogues PENG

Bo, CAO AI, ZHENG YI-JIA, YAN YI-HUA, RAN WEN-wu & ZHANG XI-ZHEN Beijing Astronomical Observatory, Beijing 100080

A meter-wave survey of the sky region north of declination +30° has been carried out with the Miyun Synthesis Radio Telescope (MSRT) at 232 fdHz. It is a moderately deep meter-wave survey, working at a frequency intermediate betwen the 6C (151 MHz) and B2/B3 (408 MHz) catalogues among the tens of radio sky surveys. Its resolution is nearly the same as theirs, and the MSRT sky region surveyed is almost the same as that of 6C, while B2/B3 covers a much smaller region. In this