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CO 2 deposit at polar regions. Comparison between HEND (Mars Odyssey) and MOLA (MGS). Litvak M.L 1) , Mitrofanov I.G. 1) , Zuber M.T. 2) Smith D.E. 3) , Kozyrev A . S. 1) , Sanin A.B. 1) , Tretyakov V.I. 1) , Boynton, W . 4) ,Hamara D. 4) , Shinohara C. 4) - PowerPoint PPT Presentation
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page 1
W o r k s h o p H E N D - 2003
2001 Mars OdysseyInstitute for Space Research, June 9 - 11, 2003
CO2 deposit at polar regions. Comparison between HEND (Mars Odyssey) and MOLA
(MGS)
page 2
W o r k s h o p H E N D - 2003
2001 Mars OdysseyInstitute for Space Research, June 9 - 11, 2003
Litvak M.L1), Mitrofanov I.G.1), Zuber M.T.2) Smith D.E.3), Kozyrev A.S. 1),
Sanin A.B.1), Tretyakov V.I.1) , Boynton, W. 4),Hamara D.4), Shinohara C.4)
Saunders R.S.5), Drake D.6)
1) Space Research Institute, Moscow, Russia 2) Massachusetts Institute of Technology, Cambridge,USA
3) NASA/Goddard Space Flight Center, USA4) University of Arizona, Tucson, USA5) JPL, Pasadena, USA6) LANL, USA
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W o r k s h o p H E N D - 2003
2001 Mars OdysseyInstitute for Space Research, June 9 - 11, 2003
Ls=3300 - 3600
Ls=300 - 600
Ls=900 - 1200
North Summ
er
South North
OBSERVATIONS
page 4
W o r k s h o p H E N D - 2003
2001 Mars OdysseyInstitute for Space Research, June 9 - 11, 2003
North hemisphere → sublimation of CO2 frost
Latitude belts:
85N-90N →80N-85N →75N-80N →70N-75N →65N-70N →60N-65N →
No
rmal
ized
neu
tro
n f
lux
Ls, degree
page 5
W o r k s h o p H E N D - 2003
2001 Mars OdysseyInstitute for Space Research, June 9 - 11, 2003
South hemisphere → accumulation of CO2 frost
Latitude belts:
85S-90S →80S-85S →75S-80S →70S-75S →65S-70S →60S-65S →
No
rmal
ized
neu
tro
n f
lux
Ls, degree
page 6
W o r k s h o p H E N D - 2003
2001 Mars OdysseyInstitute for Space Research, June 9 - 11, 2003
MULTI LAYER MODEL
1 Atmosphere thickness: 5-25 g/cm2
2 Seasonal CO2 frost : variable thickness3 Upper dry layer: 1-3% wt H2O; variable thickness
4 Bottom infinite ice layer: >30% wt H2O
1 Atmosphere thickness: 5-25 g/cm2
2 Seasonal CO2 frost : variable thickness3 Upper dry layer: 1-3% wt H2O; variable thickness
page 7
W o r k s h o p H E N D - 2003
2001 Mars OdysseyInstitute for Space Research, June 9 - 11, 2003
COMPARISON BETWEEN HEND AND MOLA
HE
ND
dat
a
MOLA data
North: The comparison between HEND and MOLA has been done for the same Ls in different latitude belts. There is good agreement between HEND vs. MOLA observations and model curves calculated for regolith model with 75% wt H2O in bottom layer. 80N-85N: 10 g/cm2 depth of ice layer. 75N-80N: 40 g/cm2 depth of ice layer.
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W o r k s h o p H E N D - 2003
2001 Mars OdysseyInstitute for Space Research, June 9 - 11, 2003
North hemisphereNorth hemisphere South hemisphereSouth hemisphere
Model: Upper layer thickness estimations
page 9
W o r k s h o p H E N D - 2003
2001 Mars OdysseyInstitute for Space Research, June 9 - 11, 2003
North hemisphereNorth hemisphere South hemisphereSouth hemisphere
CO2 frost at different seasons: Ls=345o
No CONo CO22 frost frost
page 10
W o r k s h o p H E N D - 2003
2001 Mars OdysseyInstitute for Space Research, June 9 - 11, 2003
North hemisphereNorth hemisphere South hemisphereSouth hemisphere
CO2 frost at different seasons: Ls=15o
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W o r k s h o p H E N D - 2003
2001 Mars OdysseyInstitute for Space Research, June 9 - 11, 2003
North hemisphereNorth hemisphere South hemisphereSouth hemisphere
CO2 frost at different seasons: Ls=40o
page 12
W o r k s h o p H E N D - 2003
2001 Mars OdysseyInstitute for Space Research, June 9 - 11, 2003
North hemisphereNorth hemisphere South hemisphereSouth hemisphere
CO2 frost at different seasons: Ls=70o
page 13
W o r k s h o p H E N D - 2003
2001 Mars OdysseyInstitute for Space Research, June 9 - 11, 2003
North hemisphereNorth hemisphere South hemisphereSouth hemisphere
CO2 frost at different seasons: Ls=95o
page 14
W o r k s h o p H E N D - 2003
2001 Mars OdysseyInstitute for Space Research, June 9 - 11, 2003
North hemisphereNorth hemisphere South hemisphereSouth hemisphere
CO2 frost at different seasons: Ls=125o
No CONo CO22 frost frost
page 15
W o r k s h o p H E N D - 2003
2001 Mars OdysseyInstitute for Space Research, June 9 - 11, 2003
CONCLUSIONSCONCLUSIONS
Mars seasonal changes are distinctly seen in HEND data. There is good correlation between HEND (Mars Odyssey) data and MOLA (MGS) measurements of CO2 frost at different north latitudes.
Comparison HEND and MOLA data shows that visible effects may be easily explained based on two-layers model of regolith.
The model estimation of CO2 frost thickness shows that North and South differs each other. CO2 frost on South is thinner at near pole latitudes and demonstrate more irregular behavior then on North.
