X-rays from dusty comets: some prospects for space observations

Discovery of soft X-ray radiation, 0.09-2 keV photons, from comet Hyakutake C/1996 B2 by orbital space observatory ROSAT on March 27, 1996 opened a new area for studying comets as well as interplanetary medium, using comets as natural space probes. However, almost all cometary X-ray observations carried out so far cover only outer heliosphere, i.e., heliocentric distances equal or more than 1 AU. Some pecularities and prospects connected with future X-ray observations of dusty comets having retrograde and/or near-polar orbital motions, like comet Halley 1986 III (inclination i=162 deg.) and Hyakutake (i=125deg.), in the inner Solar System are marked, taking into account generation of high-temperature plasma by high-velocity collisions between cometary and interplanetary dust particles.