We present a scenario for the origin of the hot plasma in our Galaxy as a m
odel of strong X-ray emission [similar to 3 - 10 keV; L-X (2 - 10 keV) simi
lar to 10(38) erg s(-1)], called Galactic Ridge X-ray Emission (GRXE), whic
h has been observed near to the galactic plane. GRXE is thermal emission fr
om a hot component (similar to 7 keV) and a cool component (similar to 0 8
keV). Observations suggest that the hot component is diffuse, and that it i
s not escaping away freely. Both what heats the hot component and what conf
ines it in the galactic ridge still remain puzzling, while the cool compone
nt is believed to be created by supernovae. We propose a new scenario: the
hot component is heated by magnetic reconnection, and confined by a helical
magnetic field produced by magnetic reconnection. We solved two-dimensiona
l magnetohydrodynamic equations numerically to study how magnetic reconnect
ion, triggered by a supernova explosion, creates hot plasmas and magnetic i
slands (helical tubes), and how the magnetic islands confine the hot plasma
s in the Galaxy. This is one of the possible mechanisms to trigger reconnec
tion in the Galaxy. We conclude that magnetic reconnection is able to heat
the GRXE plasma if the magnetic field is localized in an intense flux tube
with B-local similar to 30 mu G.