In this website, you can "search", "browse" and "management" FITS and NetCDF data published on " AKATSUKI Science Data Archive" website.



You can search the L2 or L3 data you want to see. You can narrow down the data by date, filter name, and some other conditions.

L2 Data Index

You can see all Level 2 data.

L3 Data Index

You can see all Level 3 data.



After you sign in as a user, you can save "data" or "search condition" you want to memorize. User registration can be done from "Sign-up" button in the upper right. In "Bookmarks", you can see the list of search conditions that users have specified as "public".

Download・Generate GIF Image

In the search result or data index page, if you check the necessary images and press "download" button, you can download "FITS files and JPEG images" for L2 data and "NetCDF files and PNG images" for L3 data. Also, if you press the "Generate GIF Image" button, you can download a GIF animation. You can select up to 10 at a time.

Overview of the data

UVI (Ultraviolet Imager) IR1 (1-µm Camera) IR2 (2-µm Camera) LIR (Longwave Infrared Camera)
UVI acquires ultraviolet images, allowing us to obtain the distribution of sulfur dioxide, which is related to the cloud formation, and the distribution of unidentified chemical substances which absorbs the ultraviolet rays. Alse, we can measure the wind speed at the cloud tops by tracing the dark-and-light pattern due to the scattering of ultraviolet rays in sunlight by Venusian clouds. By utilizing the wavelength bands around 1µm, which allows for seeing below clouds and near the surface of Venus, and by comparing infrared intensities of different bands, we can investigate the movement of clouds in the lower atmosphere, the distribution of water vapor, the mineral composition of the surface, and can check for the presence of active volcanoes. The 2-µm wavelength, which is emitted from below the bottom of Venus' clouds, allows for observing their density, the size of the cloud particles, the distribution of carbon monoxide, and other parameters, allowing for insights into atmospheric circulations at lower altitudes and into how clouds are formed. Zodiacal light was also measured en route to Venus to investigate on the dust distributed in the solar system. Infrared radiation of 10-µm wavelength is used to measure the temperature at the cloud tops. Two-dimensional temperature distribution at cloud tops can be used to investigate various types of waves and convection within the upper cloud layer, as well as wind speed distribution on the upper cloud tops of both dayside and nightside.
For detail, please refer to "Spacecraft / Instruments", "Observation" of the AKATSUKI project

Definition of Product Level

Level 2 (l2b, l2c) Level 3 (l3b, l3bx, l3c, l3cx)
Level 2 (L2) data means calibrated data (physical value in FITS format). For IR1, data not using estimation of amount of smear at missing pixel for calibration is l2b, and using it is l2c. For LIR , data not using hood temperature for calibration is l2b, and using it is l2c. Level 3 (L3) data means calibrated data (physical values at equally spaced longitude-latitude grid in NetCDF format) derived from l2b and l2c. Data not using pointing corrected geometry information at the center of each pixel are l3b and l3c, and using it are l3bx and l3cx.



Kousei Murakso, National Institute of Technology, Matsue College, (2018-4 ~ )
Kazuki Oomori, National Institute of Technology, Matsue College, (2017-4 ~ 2018-4)
Takumi Aoki, National Institute of Technology, Matsue College, (2016-4 ~ 2017-4)


Shin-ya Murakami, Japan Aerospace Exploration Agency
Kouichirou Sugiyama, National Institute of Technology, Matsue College