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   51004
   We propose a 40 ksec observation of the 2.3-ms pulsar PSR J0218+4232,
   from which sharp pulsed X-ray emission has been detected with ROSAT and
   EGRET. Pulsating emission from millisecond pulsars can be divided into
   two categories; magnetospheric origin like PSR 1821-24 and surface
   origin like PSR J0437-4715. PSR J0218+4232 occupies a position between
   PSR 1821-24 and PSR J0437-4715 from both view of spin down luminosity
   and characteristic age, which makes this pulsar the best target to
   study the turn over of two emission mechanisms. Taking advantage of the
   high sensitivity in the hard X-ray band and the excellent timing
   capability of ASCA, we plan to achieve the following goals: 1) to study
   the energy spectrum of steady and pulsed components; 2) to determine
   the multi color light curve.
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