Coordinated Analysis of the Interstellar Focusing Cone at 1 AU - Effort by an ISSI Team

In a dedicated ISSI (International Space Science Institute) Team we have analyzed the combined data sets from coordinated campaigns to observe the interstellar helium cone with in-situ and remote sensing methods, including the necessary supporting observations over three years from 1998 through 2000. The data sets are comprised of observations of pickup ions with ACE and Ulysses SWICS, neutral atoms with Ulysses GAS, UV backscattering with SOHO UVCS and EUVE. We have made use of simultaneous monitoring of solar UV radiation with SOHO and of the interplanetary conditions with SOHO, ACE and WIND. The analysis is comprised of detailed modeling of the interstellar gas and its secondary products in the heliosphere. This effort has resulted in a consistent set of interstellar He parameters. Previous apparent differences between the complementary observations could be traced to incomplete information on ionization rates and solar illumination of the interstellar gas in the inner heliosphere. Results and implications will be presented.