INNER HELIOSPHERE SCIENCE OBJECTIVES:

INTERACTION AT THE HELIOSPHERIC INTERFACE:

• Deduce filtration of H and O from the bulk flow and temperature change compared with He (using gravitational focusing of the Sun)
• Constrain ISM B-field direction from possible flow vector deviation of O and H
• See figure: Simulation of Oxygen

BULK PARAMETERS OF THE ISM:

• Bulk flow vector (using gravitational focusing of the Sun)
• Neutral density
• Temperature

DETERMINE RADIATION PRESSURE DIRECTLY:

• For trajectories of H and possibly D

Neutral Gas and Pickup Ion Measurements complement each other and allow cross-calibration

RELATED FIGURE:

IMAGING OF THE INTERSTELLAR GAS FLOW IN THE INNER HELIOSPHERE

See related figure: Simulation of Oxygen at 1 AU

On to Instrument Requirements

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