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The North Polar Cap of Mars: 2007-2012

The North Polar Cap of Mars: 2007-2012. Richard W. Schmude, Jr. Gordon State College. Overview. Introduction Method and Software Results/Discussion Conclusions. Introduction. Introduction. Sublimation: solid turns into a gas NPC undergoes sublimation

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The North Polar Cap of Mars: 2007-2012

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  1. The North Polar Cap of Mars:2007-2012 Richard W. Schmude, Jr. Gordon State College

  2. Overview • Introduction • Method and Software • Results/Discussion • Conclusions

  3. Introduction

  4. Introduction • Sublimation: solid turns into a gas • NPC undergoes sublimation • Water ice sublimes slower than carbon dioxide ice

  5. Introduction • Areocentric Longitude (Ls) describes seasons

  6. Method • WinJupos • Software used in measuring NPC latitudes • Mars images are given a name with numbers • WinJupos uses name to compute the date & time • WinJupos computes orientation of image • One can measure longitude and latitude with the cursor

  7. MethodMeasure latitude at several longitudes

  8. Method Latitudes at all longitudes

  9. Results: 2009-2012

  10. Results: 2012

  11. Results: 2000 & 2009-2012

  12. Results: Comment • Each latitude value is based on an average of ~80 measurements • Accruacy of 1 measurement: ~1.0 arc-second • Accruacy of the average of 80 measurements: 1.0 arc-second ÷ square root of 80

  13. Discussion: Statistical Tests • Wilcoxon Signed Rank Test • Non-parametric Test • Is there differences in NPC size in different years? • Runs Test for Randomness • Non-parametric Test • Are the cap radii random or not?

  14. Discussion Wilcoxon Signed Rank Test results

  15. Discussion: Are NPC latitudes random at different longitudes?

  16. Randomness test results • 2009-2010 (22° ≤ Ls ≤ 70°) • 9 our of 12 Ls intervals are non-random • 2012 (50° ≤ Ls ≤ 98°) • 10 out of 12 Ls intervals are non-random

  17. 2007-2008 Results • NPC was larger at Ls = 12° than 20°. • NPC was larger at Ls = 20° than for Ls > 20°. • NPC had more random longitudes for Ls = 10° to 22° than for Ls greater than 30°.

  18. Conclusions • NPC: larger in 2009-2012 than in 1990-1997 • NPC: larger in 2009-2010 than in 2000 • NPC latitudes with respect to longitude were usually not random in 2009-2012

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