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We report the results of optical polarimetric observations of a Bok globuleCB34 to study magnetic field structure on large scales ($10^5-10^6$ AU), whichis combined with archival sub-mm observations to characterize the magneticfield structure of CB34 on small scales ($10^4 - 10^5$ AU). The opticalpolarization measurements indicate that the magnetic field in the globule isconstrained to a maximum radius of $10^5$AU around the core, out to densitiesnot smaller than $10^4$cm$^{-3}$. Our study is mainly concentrated on twosubmillimeter cores C1 and C2 of CB34. The direction of magnetic field of coreC2 is found to be nearly perpendicular to the CO outflow direction of theglobule. The magnetic field of core C1 is almost aligned with the minor axis ofthe core which is typical for magnetically dominated star formation models. Themean value of offset between the minor axis of core C2 and the outflowdirection is found to be $14^\circ$ which suggests that the direction of theoutflow is almost aligned with the minor axis of core C2. The magnetic fieldstrength in the plane-of-sky for cores C1 and C2 is estimated to be $\approx34\mu$G and $\approx 70\mu$G.

Magnetic field geometry of the large globule CB 34