First Sky Map of the Inner Heliosheath Temperature Using IBEX Spectra

摘要: Analysis of the IBEX-Hi Energetic Neutral Atom spectra reveals, for first time, sky map source ion temperatures. The solar wind exists in non-equilibrium stationary states and can be described by kappa distributions. high-energy asymptotic behavior distributions leads to a power law flux versus energy spectrum, while its specific formulation derives temperature index that govern these We find observed most directions is about million degrees, agreement with heliospheric models inner heliosheath. Thus, termination shock stronger places than revealed Voyagers' observations at their two unique crossing points. global maps indicate low-temperature regions various directions, including toward Voyager 2 where an order magnitude lower, consistent situ observations. Interestingly, vast majority measured indices are between {approx}1.5 {approx}2.5, far-equilibrium 'cavity' minimum entropy discovered Livadiotis McComas. suggest Ribbon string localized regions, thermodynamical differentiates it from distributed flux. A simple model developed derive themore » density, heliosheath thickness, thermal pressure. pressure {approx}3.5 pDyn cm{sup -2}, roughly equal mechanical exerted Local Interstellar Medium.« less