In situ measurement requirements for a solar probe

Physics

Scientific paper

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Solar Instruments, Particle Emission, Solar Wind, Remote Observing Techniques

Scientific paper

We present the rationale and in situ measurement requirements for a near-Sun mission intended to answer the central questions of the heating of the corona and the acceleration of the solar wind. These conclusions are based on panel discussions and presentations at the Marlboro workshop. We have in mind not a ``minimum'' mission [1], but rather one that is constrained but feasible within the current mass and telemetry rate restrictions. To distinguish between thermal, wave-driven, and microflare-driven models, the measurements must determine wave levels in a broad range of frequencies, resolve fine-scale structures, find the energetic particle content and its variations, and determine the bulk properties of a few species with detailed distributions for at least electrons and protons. We find that the in situ measurements needed to answer the main questions are similar to those proposed previously [4] (magnetic field, plasma, high-energy particles, and plasma wave instruments) but without neutron and dust experiments. Telemetry and mass constraints will be significant but should not be prohibitive.

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