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LXO Kick-Off Meeting

LXO Kick-Off Meeting. Agenda: Introduction (this talk) Steve: 10 min Solar System science with X-rays Mark: 10 min Basic Feasibility Study Jenny: 10 min Round-table discussion ~ 1.5 hours (?).

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LXO Kick-Off Meeting

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  1. LXO Kick-Off Meeting Agenda: Introduction (this talk) Steve: 10 min Solar System science with X-rays Mark: 10 min Basic Feasibility Study Jenny: 10 min Round-table discussion ~ 1.5 hours (?) LXO stands for Lunar X-ray Observatory, but this is only a placeholder name. Location on the moon has logistical and political advantages – but is not a necessary requirement.

  2. Primary Science Goal: study of SWCX mechanism A Lunar X-ray Observatory properly placed on the Moon will observe soft X-ray emission from the interaction of the solar wind with both the magnetosheath and the lunar atmosphere.

  3. LXO: example configuration: Simple collimated device Basic Constraints based on ALSEP experience: Mass < 40 kg Power < 75W • Mass < 40 kg (self-contained power system, i.e. solar cells + battery) • Mass < 20 kg (external PSU common to multiple experiments) • Power < 70W if actively cooled with Thermal Electric Cooler (TEC) • Power < 20-30W if passively cooled and operated during lunar night.

  4. A model of the X-ray background (black), the magnetosheath (SWCX) (red), and the SWCX emission from the lunar atmosphere (green). All have similar strengths and spectral shape. A collimated device will be able to separate the components only by looking at time variability of the components.

  5. Lunar atmosphere contribution…. Simulation of the soft X-ray emission as a function of Position in the lunar sky. (Trávniček et al. 2005) Suggests optimum location to provide greatest contrast is polar position with view zenith angle ~ 900

  6. Magnetosheath contribution…. Magnetosheath Imaged! A model of the strength of the magnetospheric SWCX emission as a function of position around the Earth (at origin) (Robertson & Cravens 2003).This is NOT a static picture: soft X-ray imaging can be used to study the dynamical interaction between the magnetosheath and the solar wind.

  7. Technical Requirements Wish List: • Imaging capability • FOV ~ 30 degrees • Angular Resolution ~ 1.5 arcminutes • Detector pixel size ~ 200 microns • Soft X-ray response (0.2 – 1.5 keV) • CCD quality energy resolution or better • Large Area Detector • ~ 20 cm x 20 cm • “Moderate” timing capability

  8. R = 100 cm FOV = 30° D = ~26 cm!

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