Can Jupiters be found by monitoring Galactic bulge microlensing events from northern sites?

In 1998 the EXPORT team monitored microlensing event light curves using a c harge-coupled device (CCD) camera on the IAC 0.8-m telescope on Tenerife to evaluate the prospect of using northern telescopes to find microlens anoma lies that reveal planets orbiting the lens stars. The high airmass and more limited time available for observations of Galactic bulge sources make a n orthern site less favourable for microlensing planet searches. However, the re are potentially a large number of northern 1-m class telescopes that cou ld devote a few hours per night to monitor ongoing microlensing events. Our IAC observations indicate that accuracies sufficient to detect planets can be achieved despite the higher airmass.