Instrument Overview

LIR detects thermal emission from the cloud top in a wavelength region 8 -- 12 μm to map the cloud-top temperature.

Data Download, metadata, citation information

• VCO Akatsuki LIR bundle (urn:jaxa:darts:vco_lir)
• Level 3 dataset (Map data)

• Old version (Superseded):
  • Level 1b dataset (Raw data, VCO-V-LIR-2-EDR-V1.0)
  • Level 2 dataset (Calibrated data, VCO-V-LIR-3-CDR-V1.0)
  • geometry information dataset (VCO-V-LIR-3-SEDR-V1.0)

Documents

• Software Interface Specification for the Venus Climate Orbiter Akatsuki Longwave Infrared Camera Data Products Version 1.0
• List of Observation Programs (for UVI, IR1, IR2, and LIR) (v05) HTML, PDF, ASCII text
• List of FITS header keywords (for UVI, IR1, IR2, and LIR) (v07) HTML, PDF, ASCII text
• Description of the image coordinate (for UVI, IR1, IR2, and LIR) ASCII text
• Level 3 Variable Description (v01)
• Level 3 Algorithm Description (v01)
• Cloud Motion Vector Data Document

Definition of Product Level

Level 1b (l1b)

raw data (count value in FITS format)

Level 2b (l2b)

calibrated data (physical value in FITS format) without calibration using baffle (hood) temperature

Level 2c (l2c)

calibrated data (physical value in FITS format) with calibration using baffle (hood) temperature

Level 2d (l2d)

calibrated data (physical value in FITS format) with calibration using baffle (hood) temperature and sensitivity degradation

geometry (geo)

geometry information (latitude, longitude, local time, phase angle, incidence angle, emission angle, azimuthal angle) at the center of each pixel.

Level 3 (l3b, l3bx, l3c, l3cx, l3d, l3dx)

calibrated, physical values at equally spaced longitude-latitude grid in NetCDF format, derived from l2b, l2c, and l2d data (l3b, l3c, and l3d, respectively), and pointing corrected geometry information at the center of each pixel (l3bx, l3cx, and l3dx, respectively).

Cloud Motion Vector (CMV)

CMVs at equally spaced longitude-latitude grid in NetCDF format obtained by using l3b, l3c, or l3d data.

File Naming Convention

Filename is in "CAM_DATE_TIME_KIND_LEVEL_VER.EXT" format.

CAM

Name of the camera: lir for LIR.

DATE

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

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 -- 60): e.g., 052704 for 05:27:04.

KIND

kind of filter or image type: pic for picture, opn for open image, and sht for shutter (close) image.

LEVEL

level of product: l1b, l2b, l2c, l3b, l3bx, l3c, l3cx, l3d, l3dx, and geo.

VER

version string: v10 for "version 1.0".

EXT

extension that represents file type: fit for FITS file, jpg for JPEG file, png for PNG file, lbl for PDS3 label file, xml for PDS4 label file, and nc for NetCDF file.

Data Processing tools

• For visualization:
  • SAOImage DS9
  • FV
  • GIMP
• For analysis:
  • CFITSIO (library for C and Fortran)
  • SFITSIO (library for C++)
  • astropy.io.fits (Python package)

Related Papers

Please see list of publications of AKATSUKI

Contacts

For questions concerning this archive:

Shin-ya Murakami, Japan Aerospace Exploration Agency, murakami.shinya _AT_ jaxa.jp

Yukio Yamamoto, Japan Aerospace Exploration Agency, yamamoto.yukio _AT_ jaxa.jp

For questions concerning the data:

Toru Kouyama, National Institute of Advanced Industrial Science and Technology, t.kouyama _AT_ aist.go.jp

Makoto Taguchi, Rikkyo University, taguchi _AT_ rikkyo.ac.jp

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