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A disconcerting mismatch of thermal pressures for two media in contact witheach other, (1) the warm, Circum-heliospheric Interstellar Medium (CHISM) and(2) the very hot material within a much larger region called the Local Bubble(LB), has troubled astronomers for over two decades. A possible resolution ofthis problem, at least in part, now seems possible. We now understand thatearlier estimates for the average electron density in the very hot LB plasmawere inflated by an unrecognized foreground contamination to the low energydiffuse X-ray background measurements. This foreground illumination arises fromphotons emitted by charge exchange reactions between solar wind ions andneutral atoms from the interstellar medium that enter into the heliosphere.However, with the resolution of this problem comes a new one. The highionization fraction of helium in the CHISM, relative to that of hydrogen, couldbe understood in terms of the effects from a strong flux of EUV and X-rayradiation coming from both the Local Bubble and a conductive interface aroundthe CHISM. A revision of this interpretation may now be in order, now that thephotoionization rate from radiation emitted by hot gas the Local Bubble islower than previously assumed.

Pressure and Ionization Balances in the Circum-Heliospheric Interstellar Medium and the Local Bubble