Upcoming venus exploration by akatsuki venus climate orbiter
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Upcoming Venus exploration by AKATSUKI/Venus Climate Orbiter. M. Nakamura, T. Imamura, T. Satoh, and VCO Team Japan Aerospace Exploration Agency. Flight model before launch. Vibration test. Thermal vacuum test. Akatsuki launch: May 21, 2010. First light. UVI 365nm. LIR 10μm. IR1 0.9μm.

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Upcoming Venus exploration by AKATSUKI/Venus Climate Orbiter

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Upcoming venus exploration by akatsuki venus climate orbiter

Upcoming Venus exploration by AKATSUKI/Venus Climate Orbiter

M. Nakamura, T. Imamura, T. Satoh, and VCO Team

Japan Aerospace Exploration Agency


Flight model before launch

Flight model before launch


Upcoming venus exploration by akatsuki venus climate orbiter

Vibration test

Thermal vacuum test


Akatsuki launch may 21 2010

Akatsuki launch: May 21, 2010


First light

First light

UVI 365nm

LIR 10μm

IR1 0.9μm


Venus climate orbiter akatsuki planet c project

Venus Climate Orbiter/Akatsuki(PLANET-C project)

  • First Japanese Venus mission

  • Science target :

    • Mechanism of super-rotation

    • Structure of meridional circulation

    • Meso-scale processes

    • Formation of H2SO4 clouds

    • Lightning

    • Active volcanism, inhomogeneity of surface material

    • Zodiacal light (during cruise)

  • Launch : May 21, 2010  Arrival: December 7, 2010

  • Mission life :More than 2 Earth years


Comparative planetary meteorology

Comparative planetary meteorology


Cloud processes

Cloud processes

  • Dynamics of cloud formation, role of meridional circulation in transporting cloud-related species

  • Origin of UV markings

  • Whether lightening occurs or not

Schubert (1983)


Observation from an orbiter

Observation from an orbiter

Lightning and airglow camera

Longwave IR camera (cloud temperature)

  • 4 cameras sounding different altitudes, a high-speed lightning detector, and an ultra-stable oscillator for radio science

  • Constructing 3-D model of atmospheric dynamics

Ultraviolet imager (cloud top)

1-mm camera (surface)

2-mm camera (lower atmosphere)

Radio science (vertical structure)


Upcoming venus exploration by akatsuki venus climate orbiter

LIR

LAC

UVI

IR1

IR2


Onboard instruments

Onboard instruments


Observations to be conducted during one orbital revolution

Resolution: 10-20 km

Observations to be conducted during one orbital revolution

Successive Global images

of atmosphere and ground

surface (~24 hours)

Limb images

(~0.5 hour)

Orbital period: 30 hours

Close-up images/

Lightning/Airglow

(~3 hours x 2)

Temperature / H2SO4

vapor / Ionosphere

by radio occultation


Wavelengths for cloud tracking

Wavelengths for cloud-tracking

365nm, cloud top (65km), dayside

10mm, cloud top (65km), dayside & nightside

2.02mm, cloud top(65m), dayside

365 nm image taken by PVO/OCPP

8.6 um image taken by Subaru telescope, high-pass filtered

Cloud altimetry by VenusExpress/VIRTIS

0.9mm, lower cloud (50km), dayside

2.3mm, lower cloud (50km), nightside

* Cloud top and bottom will be covered on both dayside and nightside.

0.98 um image taken by Galileo/SSI

2.3 um image taken by Galileo/NIMS


Accuracy of wind velocity measurement

Accuracy of wind velocity measurement

  • Cloud position accuracy is assumed to be 1 pixel.

  • Mean meridional circulation is obtained by averaging large number of vectors and will be determined with much higher accuracy than above estimates.


Latitude and local solar time of radio occultation

Latitude and local solar time of radio occultation

  • 360-deg local time coverage in the tropics Thermal tides including sub-cloud region

  • Intensive observation in the sub-solar region  Origin of ‘cells’

  • Locations probed by radio occultation will be imaged by cameras a short time before or after the occultation.


3 d sounding

3-D sounding


Data processing pipeline

Data processing pipeline

Level 0 : Uncompressed images

  • Level 2 and Level 3 data will be released to the public with PDS-like label files.

Level 1 : Calibrated images with FITS header

Level 2 : Calibrated images with FITS header, including geometry information

Level 3 : Wind vectors and other higher-level products on longitude-latitude grids in NetCDF format


Complementary missions

Complementary missions

Coordinated observations are being planned.


Summary

Summary

  • VCO/Akatsuki will address the unique dynamical state of the Venus atmosphere with systematic sampling of meteorological variables from equatorial orbit.

  • Three-dimensional structure of the atmosphere and its temporal variation will be observed by using 4 cameras, a high-speed lightning detector and radio occultation.

  • Data processing pipeline is under development. Wind vectors as well as image data and radio occultation data will be released to the public.

See you soon at Venus !


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