Recent Major Activities related to VCO/PLANET-C (in August-October 2007)

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1 4th meeting of the Venus Exporation Anaysis Group Recent Major Activities reated to VCO/PLANET-C (in August-October 2007) Proto-fight mode (PM) integration test Mechanica test mode (MTM)! Ground-based observations Education and pubic outreach (EPO)!

2 4th meeting of the Venus Exporation Anaysis Group Schedue of VCO

3 4th meeting of the Venus Exporation Anaysis Group

4 4th meeting of the Venus Exporation Anaysis Group 5138/6163#9#:1'3.27#$%"&'% (5:$+ Lightning Airgow ;&6<2'#=131/%. >.&?/'261?<#-61/ (=> %0&#)*#$%"&'% (5)*+ -./'%012.&/#)"%3&' (-4)+,µ"#$%"&'% ()*,+!µ"#$%"&'% ()*!+ Coud top temperature Sufur dioxide Unknown absorber Water vapor Lower coud Lower coud Carbon dioxide

5 4th meeting of the Venus Exporation Anaysis Group 30 minutes IR2 dark : 5 images --> median IR2 1.73um : 5 images --> median IR2 2.26um : 5 images --> median IR2 dark : 5 images --> median IR1 dark : 5 images --> median IR1 1.01um : 5 images --> median IR1 dark : 5 images --> median IR2 dark : 5 images --> median IR um: 5 images --> median IR2 dark : 5 images --> median IR1 dark : 5 images --> median IR1 0.97um : 5 images --> median IR1 0.90um : 5 images --> median IR1 dark : 5 images --> median UVI dark : 5 images --> median UVI 283nm : 5 images --> median UVI dark : 5 images --> median UVI dark : 5 images --> median UVI 365nm : 5 images --> median UVI dark : 5 images --> median IR1 dark : 5 images --> median IR1 0.90um : 5 images --> median IR1 dark : 5 images --> median IR2 dark : 5 images --> median IR2 2.02um : 5 images --> median IR2 dark : 5 images --> median LIR dark : 64 images -->average LIR 10um : 64 images -->average LIR dark : 64 images -->average onboard caibration onboard caibration onboard caibration onboard caibration onboard caibration onboard caibration image comprssion onboard caibration onboard caibration onboard caibration

6 4th meeting of the Venus Exporation Anaysis Group

7 4th meeting of the Venus Exporation Anaysis Group

8 4th meeting of the Venus Exporation Anaysis Group

9 4th meeting of the Venus Exporation Anaysis Group S!

10 4th meeting of the Venus Exporation Anaysis Group

11 4th meeting of the Venus Exporation Anaysis Group Ongoing tasks Therma test mode (TTM)!! In preparation (January 2008)! Verifying appropriateness of therma design of the spacecraft. Deveoping data-anaysis toos! Coud tracking Cross-correating image subsets (from images with 2-hour interva) are used to precisey determine the motion of coud features. The agorithm is testedon many images (with various conditions) forrobustness. Promising resuts are obtained: fine structure of the wind vectors revea possibe therma tide in Venus atmosphere. Wind vectors overaid on an im subset (UV data from Gaieo S showing possibe therma tide near the equator to mid-atitude the northern hemisphere.

12 4th meeting of the Venus Exporation Anaysis Group Ground-Based Observations (1)! Miimeter-radio mappings! At Nobeyama Miimeter Array Radio waves penetrates with esser extinction due to Venus thick coud, aowing to probe wind profies and temperatures at atitudes where gaseous absorption imits the visibiity. Wind Profies: The spectrum tends to red-shift (moving away) on the night side o to bue-shift (moving towards) on the day side, suggesting possibe day-to-night circuation of the atmosphere.

13 4th meeting of the Venus Exporation Anaysis Group Ground-Based Observations (2)! Radio/Near-IR comparison Temperature: It is remarkabe that there exist regions of anti-correating temperatures: it appears hotter in radio and coder in near-ir (top right), whie the opposite is aso observed (bottom right). The cause is sti to be studied. Subaru/COMICS data, mapping coudtop temperature as observed in mid-ir. Mid-IR mappings! At Subaru Teescope Mid-IR is sensitive to coud-top temperatures. The highest spatia-resoution maps is obta being studied for spatia and tempora variations. Comparison with Venus Express (ESA) data is in progres whie VEX senses coud-top region with UV and near-ir imagers as we as the radio science.

14 4th meeting of the Venus Exporation Anaysis Group Education and Pubic Outreach Open-Campus demonstration! Sagamihara, Juy 2007 High-pressure (90 atm) demonstration, using a pressurizing chamber, for genera pubic. Thermography demonstration, to expain how PLANET-C sensors measure the temperature. Baoons with different gasses to demonstrate moecuar weight differences. Taks for schoo students and genera pubic The group member visit many schoos and museums to tak about Venus, PLANET-C, and other panetary atmosphere sciences. Preparing a 1/2-scae cartoon mode of PLANET-C, which wi be assembed by primary schoo students at a Venus tak event.

15 4th meeting of the Venus Exporation Anaysis Group JAXA HP 15