Effect of magnetic field on the thermal instability is studied in the radiatively cooling region behind an interstellar shock of moderate propagation velocity ( ∼ 10 k m / s e c ). It is shown that the presence of interstellar magnetic field of a few micro gauss is very effective in preventing the thermal instability from building-up density concentration. In the absence of magnetic field, the shock-induced thermal instability amplifies preshock density inhomogeneity by more than an order of magnitude. However, in the presence of magnetic field, the amplified density contrast is shown to be only a factor 2.

ABSTRACT
Ⅰ. INTRODUCTION
Ⅱ. STEADY-STATE SHOCK MODEL
Ⅲ. AMPLIFICATION OF UPSTREAM DENSITY INHOMOGENEITY
Ⅳ. CONCLUSION AND DISCUSSION
REFERENCES

• HONG SEUNG SOO(Department of Astronomy, Seoul National University)
• KOO BON CHUL(Korean National Astronomical Observatory)