Instrument Overview

IR1 measures the thermal radiaion mostly from the surface and a little from the atmosphere using four filters, 0.90 μm (dayside), 0.90 μm (nightside), 0.97 μm, and 1.01 μm.


Definition of Product Level

Level 1b (l1b)
raw data (count value in FITS format)
Level 2b (l2b)
calibrated data (physical value in FITS format)
geometry (geo, geo4)
geometry information (latitude, longitude, local time, phase angle, incidence angle, emission angle, azimuthal angle) at the center of each pixel (geo) and at the lower-left corner of each pixel (geo4).
Level 3 (l3, l3x)
calibrated, physical values at equally spaced longitude-latitude grid in NetCDF format, derived from l2b data (l3), and pointing corrected geometry information at the center of each pixel (l3x).
Cloud Motion Vector (CMV)
CMVs at equally spaced longitude-latitude grid in NetCDF format obtained by using l3 data.

File Naming Convention

Filename is in "CAM_DATE_TIME_KIND_LEVEL_VER.EXT" format.

Name of the camera: ir1 for IR1.
date in UTC when image taken at in "YYYYMMDD" format, where YYYY is four-digit year (2010 -- 20??), MM is two-digit month (01 -- 12), and DD is two-digit day (01 -- 31): e.g., 20151207 for 2015-12-07.
time in UTC when image taken at in "hhmmss" format, where hh is two-digit hour (00 -- 23), mm is two-digit minutes (00 -- 59), and ss is two-digit seconds (00 -- 59): e.g., 045200 for 04:52:00.
kind of filter or image type: 09d for 0.90 μm dayside filter, 09n for 0.90 μm nightside filter, 097 for 0.97 μm filter, 101 for 1.01 μm filter, dif for diffuser, and drk for dark image.
level of product: l1b, l2b, l3, l3x, geo, and geo4.
version string: v10 for "version 1.0".
extension that represents file type: fit for FITS file, jpg for JPEG file, png for PNG file, lbl for PDS3 label file, and nc for NetCDF file.

Data Processing tools


When you publish your own work based on the AKATSUKI IR1 data, please refer to the following paper(s):

  1. Iwagami, N., S. Takagi, S. Ohtsuki, M. Ueno, K. Uemizu, T. Satoh, T. Sakanoi, G. L. Hashimoto, Science requirements and description of the 1 μm camera onboard the Akatsuki Venus Orbiter, Earth, Planets and Space, 63, 487-492, doi:10.5047/eps.2011.03.007, 2011. URL

Related Papers

Please see list of publications of AKATSUKI


For questions concerning this archive:

Shin-ya Murakami, Japan Aerospace Exploration Agency, murashin _AT_
Yukio Yamamoto, Japan Aerospace Exploration Agency, yukio _AT_

For questions concerning the data:

Naomoto Iwagami, iwagami _AT_
George L. Hashimoto, Okayama University, george _AT_