Comparison of Ionospheric Observations and Dynamical Predictions of Meteor Showers at Mars Paul Withers 1 Michael Mendillo 1, Martin.

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Comparison of Ionospheric Observations and Dynamical Predictions of Meteor Showers at Mars Paul Withers 1 Michael Mendillo 1, Martin Pätzold 2, Silvia Tellmann 2, Apostlos Christou 3, Jeremie Vaubaillon 4 1 – Boston University, 2 – University of Cologne, 3 – Armagh Observatory, 4 – IMCCE, Observatoire de Paris Abstract Friday :40-09:50 DPS Meeting 2007, Orlando, Florida We identify ionospheric profiles from Mars that contain features attributable to meteoroid influx We find intervals when there are many of these profiles and call them meteor showers We study cometary orbits to identify the parent bodies responsible for the meteor showers

Meteoric Layers (MEX) Profile with EUV and X-ray layers onlyProfile with EUV, X-ray, and meteoric layers

Meteoric Layers (MGS) Profile with EUV and X-ray layers only Profile with EUV, X-ray, and meteoric layers Meteoric layers identified in 71 of 5600 (1.3%) MGS profiles Meteoric layers identified in 75 of 465 (16.1%) MEX profiles Differences due to (A) Greater measurement uncertainties for MGS and (B) Possible termination of MGS profiles during processing at ~90 km above the meteoric layer

Seasonal Distribution of Meteoric Layers (MEX) Plot shows ratio of number of profiles with meteoric layers to total number of profiles

Seasonal Distribution of Meteoric Layers (MGS) Plot shows ratio of number of profiles with meteoric layers to total number of profiles

Observed Ls (degrees) Predicted Ls (degrees) Cand- idate P 37P D/ Haneda- Campos C/1998 U5 144P P 38P 15P Observed Ls (degrees) Predicted Ls (degrees) Cand- idate D 85P 148P 25-35N/A 50-60N/A P P 88P (2102) Tanta- lus 107P

Observed Ls (degrees) Predicted Ls (degrees) CandidateMin distance (AU) P (yrs) D/Neujmin 2 85P/Boethin 148P/Anderson-LINEAR , 50-60N/A P/Honda-Mrkos-Pajdusakova P/du Toit-Hartley 88P/Howell (2102) Tantalus 107P/Wilson-Harringon P/Finlay 37P/Forbes D/Haneda-Campos (1978 R1) C/1998 U5 (LINEAR) 144P/Kushida P/Schaumasse 38P/Stephan-Oterma 15P/Finlay

Conclusions Ionospheric layers attributed to meteoroid influx have been seen at Mars Meteor showers have been identified at Mars Possible parent comets for these meteor showers have been proposed