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Effect of the October 2003 energetic particle event on Martian surface radiation D.A. Brain, J.G. Luhmann F. Leblanc R.A. Mewaldt, C.M.S. Cohen G.T. Delory.

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Presentation on theme: "Effect of the October 2003 energetic particle event on Martian surface radiation D.A. Brain, J.G. Luhmann F. Leblanc R.A. Mewaldt, C.M.S. Cohen G.T. Delory."— Presentation transcript:

1 Effect of the October 2003 energetic particle event on Martian surface radiation D.A. Brain, J.G. Luhmann F. Leblanc R.A. Mewaldt, C.M.S. Cohen G.T. Delory

2 October 2003 Event Earth and Mars “on same field line” during record-setting Halloween event Protons 1MeV to 1 GeV

3 October 2003 Event Mars Global Surveyor - Electron Reflectometer Data Energetic particles “contaminate” instrument background channels

4 SEP Events at Mars Which SEPs reach the surface? Do crustal fields play a role? What are the surface fluxes from the October 2003 event?

5 Which SEPs reach the surface? http://physics.nist.gov/PhysRefData/Star/Text/contents.html these primaries reach surface g = 3.71 m/s 2 P(0) = 6.36 mbar H = 11.1 km

6 Role of Crustal Fields Test particle trajectories Cain(n=60) crustal field Isothermal CO 2 atmosphere Release protons radially down from 1000 km

7 Role of Crustal Fields Lower energies deflected more Lower energies absorbed higher

8 Deflection at Surface Deflection is small for primaries reaching surface

9 Deflection near Exobase (~150 km) Deflection at exobase can be significant for lower energy particles

10 Energetic Particles at 400 km Geographic variation correlated with crustal source location is observed in MGS dayside electron “background” for the July 2002 event. This effect is observed after shock arrival.

11 Energetic Particles at 400 km Geographic variation correlated with crustal source location is observed in MGS dayside electron “background” for the July 2002 event. This effect is only observed after shock arrival.

12 Energetic Particles at 400 km MGS passage over crustal sources often correlated with dropouts in penetrating particles.

13 Energetic Particles at 400 km Geographic variation is difficult to detect for the October 2003 event without first removing trends in the overall background flux. Still, there may be some geographic variation.

14 Energetic Particles at 400 km

15 October Event at Surface  The time integrated GOES event spectrum resembles the SIREST SEP/SPE input spectrum http://sirest.larc.nasa.gov/ Integrated Event SpectrumSIREST Input SPE Spectrum

16 October Event at Surface GCRSEP Input Spectra Output Surface Flux neutrons (up and down) protons Surface radiation flux from SEP event exceeds that from GCRs

17 Summary Crustal fields significantly deflect incident SEPs (E0 ~ 200 keV) by 100-200 km over the strongest crustal sources at altitudes of 150 km. MGS ER must be affected by protons ~200 keV at 400 km, or some other species The surface radiation for the October 2003 SPE was orders of magnitude greater than surface radiation from GCRs. ( Our event resembled the SIREST SPE example spectrally and in terms of interplanetary flux )

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