= ir2_20230127_Horinouchi2023 Cloud motion vectors obtained from IR2 nightside images (2.26um) used in a published paper Released on 2023-01-27. Produced by: Takeshi Horinouchi = Source data and tool - Source of the data: - IR2 L2 data of internal release version v20180701 - Tool used to derive cloud motion vector - Cloud tracking program: al3ct v1.0 hgtag:6c2f21377e68fc783a76f848d958332f0586f739 == Contents File size File name md5sum 127K ir2_20160825_08-09-10-11-12-13-14_226_60x60_f3.nc 8904b9e806adebae9139f8808764cf59 == Description Cloud tracking was conducted by using an automated method described in [1] Ikegawa and Horinouchi (2016) and [2] Horinouchi et al (2017a). Its basic algorithm and quality evaluation method are presented in Ikegawa and Horinouchi (2016), and a further improvement and the data screening method are described in [2] Horinouchi et al (2017a). The data in this directory were produced for and used in [3] Horinouchi et al (2023). Please read the paper for the parameter settings and the bore-sight correction conducted. == References If you write a paper by using the data, please cite the paper [5] and the data set [4]: [1] Ikegawa, S., and T. Horinouchi (2016), Improved automatic estimation of winds at the cloud top of Venus using superposition of cross-correlation surfaces, Icarus, 271, 98-119, https://doi.org/10.1016/j.icarus.2016.01.018 [2] Horinouchi, T., S. Murakami T. Kouyama, K. Ogohara, A. Yamazaki, M. Yamada, S. Watanabe (2017), Image velocimetry for clouds with relaxation labeling based on deformation consistency, Measurement Science and Technology, 28(8), 085301 (10pp), https://doi.org/10.1088/1361-6501/aa695c [3] Horinouchi, T., S. Murakami, T. Satoh, J. Peralta, K. Ogohara, T. Kouyama, T. Imamura, H. Kashimura, S. S. Limaye, M. Nakamura, T. M. Sato, K. Sugiyama, M. Takagi, S. Watanabe, M. Yamada, A. Yamazaki, E. F. Young (2017), Equatorial jet in the lower to middle cloud layer of Venus revealed by Akatsuki, Nature Geoscience, 10, 646-651, https://doi.org/10.1038/ngeo3016 [4] Horinouchi, T., S. Murakami, K. Ogohara, T. Kouyama, M. Takagi (2021), Venus Climate Orbiter Akatsuki Cloud Motion Vector Data Set v1.0, JAXA Data Archives and Transmission System, https://doi.org/10.17597/isas.darts/vco-00020 [5] Horinouchi, T., T. Satoh, J. Peralta, Gigantic Vortices From Barotropic Instability Observed in the Atmosphere of Venus (2023), Geophysical Research Letters, 50, e2022GL101633, https://doi.org/10.1029/2022GL101633 == File contents summary "ncdump -h" output: $ ncdump -h data/ir2_20230127_Horinouchi2023/ir2_20160825_08-09-10-11-12-13-14_226_60x60_f3.nc netcdf ir2_20160825_08-09-10-11-12-13-14_226_60x60_f3 { dimensions: longitude = 120 ; latitude = 60 ; time = 1 ; text = 4096 ; variables: float longitude(longitude) ; longitude:long_name = "longitude" ; longitude:units = "degrees_east" ; float latitude(latitude) ; latitude:long_name = "latitude" ; latitude:units = "degrees_north" ; double time(time) ; time:long_name = "observation time" ; time:units = "hours since 2000-1-1 00:00:00 UTC" ; time:comment = "average of time variables in input L3a files" ; float U(time, latitude, longitude) ; U:long_name = "zonal velocity" ; U:units = "m s-1" ; U:missing_value = -6.e+36f ; float V(time, latitude, longitude) ; V:long_name = "meridional velocity" ; V:units = "m s-1" ; V:missing_value = -6.e+36f ; float C(time, latitude, longitude) ; C:long_name = "max. correlation coeff." ; C:units = "1" ; C:missing_value = -999.f ; float pr(time, latitude, longitude) ; pr:long_name = "p in relaxation labeling" ; pr:units = "1" ; pr:missing_value = -999.f ; float edof(time, latitude, longitude) ; edof:long_name = "effective degree of freedom" ; edof:units = "1" ; edof:missing_value = -6.e+36f ; float eps1u(time, latitude, longitude) ; eps1u:long_name = "estimated accuracy of the zonal winds" ; eps1u:units = "m s-1" ; eps1u:missing_value = -6.e+36f ; float eps1v(time, latitude, longitude) ; eps1v:long_name = "estimated accuracy of the meridional winds" ; eps1v:units = "m s-1" ; eps1v:missing_value = -6.e+36f ; float eps2u(time, latitude, longitude) ; eps2u:long_name = "estimated accuracy of the zonal winds" ; eps2u:units = "m s-1" ; eps2u:missing_value = -6.e+36f ; float eps2v(time, latitude, longitude) ; eps2v:long_name = "estimated accuracy of the meridional winds" ; eps2v:units = "m s-1" ; eps2v:missing_value = -6.e+36f ; float eps(time, latitude, longitude) ; eps:long_name = "estimated accuracy of the winds" ; eps:units = "m s-1" ; eps:missing_value = -6.e+36f ; float rlb(time, latitude, longitude) ; rlb:long_name = "lower bound of a confidence level of correlation coeff." ; rlb:units = "1" ; rlb:missing_value = -999.f ; char TELESCOP(text) ; TELESCOP:long_name = "telescope used to acquire data" ; TELESCOP:comment = "L2 attribute" ; char SPCECRFT(text) ; SPCECRFT:long_name = "spacecraft used to acquire data" ; SPCECRFT:comment = "L2 attribute" ; char INSTRUME(text) ; INSTRUME:long_name = "identifier of the instrument" ; INSTRUME:comment = "L2 attribute" ; char FILTER(text) ; FILTER:long_name = "filter name" ; FILTER:comment = "L2 attribute" ; char P_ID(text) ; P_ID:long_name = "instrument ID" ; P_ID:comment = "L2 attribute" ; char DATE_MAP(text) ; DATE_MAP:long_name = "date of the observation" ; DATE_MAP:comment = "L3a variable" ; char L3A_FILE(text) ; L3A_FILE:long_name = "original L3a data" ; L3A_FILE:comment = "L3c variable" ; float S_SOLLON(time) ; S_SOLLON:long_name = "sub solar longitude" ; S_SOLLON:units = "degrees_east" ; S_SOLLON:comment = "L2 attribute" ; float S_SOLLAT(time) ; S_SOLLAT:long_name = "sub solar latitude" ; S_SOLLAT:units = "degrees_north" ; S_SOLLAT:comment = "L2 attribute" ; float S_SSCLON(time) ; S_SSCLON:long_name = "AKATSUKI sub S/C longitude" ; S_SSCLON:units = "degrees_east" ; S_SSCLON:comment = "L2 attribute" ; float S_SSCLAT(time) ; S_SSCLAT:long_name = "AKATSUKI sub S/C latitude" ; S_SSCLAT:units = "degrees_north" ; S_SSCLAT:comment = "L2 attribute" ; float S_SSCLT(time) ; S_SSCLT:long_name = "AKATSUKI sub S/C local time" ; S_SSCLT:units = "hours" ; S_SSCLT:comment = "L2 attribute" ; float S_TGRADI(time) ; S_TGRADI:long_name = "target radius at sub S/C point" ; S_TGRADI:units = "km" ; S_TGRADI:comment = "L2 attribute" ; float S_CLDALT(time) ; S_CLDALT:long_name = "assumed cloud altitude" ; S_CLDALT:units = "km" ; S_CLDALT:comment = "L2 attribute" ; float S_DIST(time) ; S_DIST:long_name = "distance between S/C and Venus" ; S_DIST:units = "km" ; S_DIST:comment = "L2 attribute" ; float S_VSDIST(time) ; S_VSDIST:long_name = "Venus-Sun distance" ; S_VSDIST:units = "km" ; S_VSDIST:comment = "L2 attribute" ; // global attributes: :title = "Akatsuki L3c" ; :history = "Produced by Akatsuki Cloud-Tracking program Version 0.1.0" ; :institute = "ISAS/JAXA" ; :source = "l3_corr_ct_vSatoh/ir2_20160825_080333_226_l3_v20180701.nc, l3_corr_ct_vSatoh/ir2_20160825_090333_226_l3_v20180701.nc, l3_corr_ct_vSatoh/ir2_20160825_100333_226_l3_v20180701.nc, l3_corr_ct_vSatoh/ir2_20160825_110333_226_l3_v20180701.nc, l3_corr_ct_vSatoh/ir2_20160825_120333_226_l3_v20180701.nc, l3_corr_ct_vSatoh/ir2_20160825_130333_226_l3_v20180701.nc, l3_corr_ct_vSatoh/ir2_20160825_140333_226_l3_v20180701.nc" ; :references = "N/A" ; :comments = "Akatsuki Cloud-Tracking data comes with ABSOLUTELY NO WARRANTY." ; :command = "/home/horinout/research/akatsuki/al3dev/al3ct/src/al3ct -g 24x24 -z E -e -110:0 -u -110:0 -v -40:40 -w ON -Z 0 -I 180 -t 60x60 -s ON -L 3 -o cmv_corr_ct_vSatoh_nt7_60x60_sON/ir2_20160825_08-09-10-11-12-13-14_226_60x60_f3.nc l3_corr_ct_vSatoh/ir2_20160825_080333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_090333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_080333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_100333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_080333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_110333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_080333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_120333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_080333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_130333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_080333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_140333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_090333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_100333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_090333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_110333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_090333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_120333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_090333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_130333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_090333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_140333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_100333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_110333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_100333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_120333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_100333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_130333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_100333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_140333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_110333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_120333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_110333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_130333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_110333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_140333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_120333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_130333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_120333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_140333_226_l3_v20180701.nc,l3_corr_ct_vSatoh/ir2_20160825_130333_226_l3_v20180701.nc:l3_corr_ct_vSatoh/ir2_20160825_140333_226_l3_v20180701.nc" ; :Conventions = "TBD" ; :hg_chengeset = "420:5e7481dfff98" ; }