Several fragments of Comet Hyakutake were observed in March and April of 1996. This leads to the impression that the splitting of Comet Hyakutake on a small scale occurred frequently. Data analysis points to a rotatio...
FROM 1994-07-16 to 1994-07-22, 21 fragments of comet SL 9 impacted against Jupiter in succession. During the impact period the impact of fragments D, E, K, N, P2 and S was observed in China. We used a 1.56-m telescope...
Project supported by the National Natural Science Foundation of China.
The large accelerations of plasma were observed early in type-Ⅰ comet tail. The accelerations can reach 300 cm/S^2. Recently, the direct measurements for comet G-Z show that the energy of particles reaches 2×10~5 eV...
I.INTRODUCTION The large-scale phenomena of the plasma tail of Halley’s Comet after its passage through the perihelion have been observed with a tracking camera having an aperture of 10 cm, a focal length of 25 cm an...
Monochromatic photometry of comets is one of the important methods for investigating gasses and dust of comets. Because comets often are very faint, the observations of them are quite difficult; and in addition, the d...
There are many kinds of magnetohydrodynamic discontinuities such as the magnetopause, the sector boundary of the interplanetary magnetic field, the boundary of Ⅰ type of comet’s tail and the heliopause, in the earth...
The force-free field describes the configuration of magnetic field in the solar chromosphere and coronal active region, in the Earth’s magnetosphere, and even in the comet plasma. The force-free field has extensive a...
Ⅰ. INTRODUCTION The famous Comet Halley (whose period P=76.1 years, orbital eccentricity e=0.9673, inclination of orbit i=16202) threw men into a great panic and nervous state on May 18, 1910 before its flying past t...