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Solar Storm Radiation Model SStoRM

SStoRM provides radiation exposure estimates for Space Weather Events, aiding in astronaut safety during lunar missions. User-friendly interface allows customization for various shielding configurations and energy spectra. Includes an EVA simulation exercise for lunar surface scenarios.

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Solar Storm Radiation Model SStoRM

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  1. Solar Storm Radiation Model SStoRM http://hesperia.gsfc.nasa.gov/sspvse/posters/Ronald_Turner/October 2005Prepared byJoshua Lande1Ron Turner2 1 Model developed while at ANSER; Currently at Marlboro College, VT.2 ANSER; Suite 800; 2900 South Quincy St; Arlington, Virginia, 22206

  2. SStoRM • SStoRM will be useful as a teaching and illustration aid in understanding the severity of SPEs as our nation embarks on future missions to the Moon, Mars and beyond • It provides an accessible Graphical User Interface, allowing the user to specify • The character of the SPE (fluence and energy spectrum) • The time evolution of the SPE • It produces a radiation exposure estimates: • Absorbed Dose and Dose Equivalent • Skin, Eye, BFO • In free space and on a simplified lunar surface • There is an “Exercise Mode” of a simulation of an astronaut on EVA on the lunar surface

  3. SStoRM • Input to SStoRM: • 8,500 BRYNTRN-3 runs, each with six products: • Dose Equivalent (Skin, Eye, BFO) • Absorbed Dose (Skin, Eye, BFO) • Human represented by CAM to account for body self-shielding • Five Aluminum shielding configurations • 0.3 g/cm2 (spacesuit) • 1.0 g/cm2 (nominal rover) • 5.0 g/cm2 (heavy rover/light spacecraft) • 10.0 g/cm2 (nominal spacecraft) • 30.0 g/cm2 (nominal shelter) • Solar Energetic Particle spectra represented by:

  4. Choose the Energy Spectrum • SStoRM allows the user to specify the K, γ, and Eo parameters of the event • They also get to specify Emin, or the minimum energy value to integrate from when finding the integral flux • When the calculate button is pressed, the flux is graphed along with the spectral curve of several historical SPEs • The integral flux for all the graphed curves is compared in the chart to the right

  5. Choose the Time Evolution • Here, the user can select A, B1, and B2, the parameters of the time evolution curve • C is calculated automatically to ensure that the integral flux of the time evolution of the event is the same as the integral flux of the energy spectrum of the event • Once the calculate button is pressed, the C factor and the graph of the time evolution of the event are displayed

  6. The Estimated Dose(or “How Bad is Your SPE”) • SStoRM gives total event dose to the Skin, Eye, and BFO • It does so for thicknesses .3, 1, 5, 10, and 30 g/cm2 • The radio buttons let the user select absorbed dose or dose equivalent • Also, exposure is either for free space or on the lunar surface • The difference is that the dose on the lunar surface is half of the dose in free space

  7. Lunar EVA Exercise • This exercise allows the user to simulate an astronaut working on the moon during an SPE • The user can select a warning time that an astronaut would receive prior to the onset of the event • A negative value means that they are warned about the SPE that many hours after the event has started • They then take a given time to pack up and enter the rover • They then drive back to the base • Once at base, they stay under a heavy shielding for the remainder of the event • Shielding for spacesuit, rover, and base can be varied

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