Magnetic Pressure in the Local Bubble Shell and Cloud Against the Thermal Budget

Thermal pressure is only one term in the support of the gas around the Sun; the magnetic field contributes a pressure that polarised dust emission and the geometry of the IBEX ribbon now constrain. A field of three microgauss in the Local Interstellar Cloud gives a magnetic pressure P/k of 2,594 K per cubic centimetre, about 1.24 times the cloud thermal pressure, while an eight-microgauss field compressed into the Local Bubble shell gives 18,444 K per cubic centimetre, exceeding the hot interior thermal pressure it helps to confine. Magnetic support is therefore a leading term in both places, not a correction in either. The pressures are computed from stated published field strengths with the deposited script, not measured here.