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Data Product Descriptions

hmi.rdVtrack_fd30

Data Series Class: mapped and tracked data cubes
Creating Module: mtrack
Input Data: hmi.V_45s

Data Processing Status

Data for CR 2096:240–2125:030 (1 May 2010 – 16 July 2012) were mapped and tracked using a camera position angle that was subsequently established to be about 0°.07 in error and corrected. Reprocessing of the tracked cubes using the corrected angle, and of the data products dependent on them, was completed on 6 Nov 2021.

Data for CR 2096:240 through at least CR 2236:005 were mapped and tracked based on Dopplergrams with an ephemeris value for the Carrington longitude of disc centre that was in error by 0°.0819. Data processed with mtrack v 2.4 or higher correct for this error.

Due to inconsistent spacecraft rotation angles, data for CR 2202:270, 2202:210–180, and 2203:270 were tracked without detrending by background subtraction of the long-term averages.

Values of the keyword CRLN_OBS describing the Carrington longitude of the central meridian at the time of observation in the input Dopplergrams hmi.V_45s (and the corresponding magnetograms and other observables, as well as those in the 720-sec cadence series) were erroneous, consistently too high by 0.081894, corresponding to a time offset of 1 AU/c and a plate location offset of about 3 pixels. The correction for new data is ongoing as of 21 Jul 2022. This may introduce a detectable error in the tracking rate. Tracking of uncorrected data corrects for this error beginning with mtrack v 2.4.

For data produced with versions prior to mtrack v 2.3, the reported value of MidTime is 22.5 sec later than it should be.

Versions of creating module used to produce records in the data series:

The following records have been subsequently reprocessed and exist in multiple versions in the DRMS database:

Records for CR 2096–2101 that were reprocessed in 2020 (between Sep 27 and Dec 6) were subsequently removed due to an error in the tracking code used at the time.

For current processing status, see the Ring-Diagram Status page.

Data Notes

The value of LonSpan is undefined in all records for the following Carrington times:
2099:360, 2101:180, 2108:240, 2115:300, 2115:270, 2116:090, 2121:210, 2121:090,
2128:270, 2128:120, 2134:150, 2135:360, 2141:180, 2147:060, 2154:180, 2159:060,
2159:030, 2160:330, 2160:300, 2163:090, 2167:090, 2169:300, 2172:030, 2174:150,
2180:330

JSOC Series Definition

#=====Global Series Information=====
Seriesname:	hmi.rdVtrack_fd30
Description:	"30-deg Doppler cubes on ring-diagram synoptic grid tracked for 1/12 CR"
Author:		"Rick Bogart"
Archive:	1
Unitsize:	1
Retention:	55
StagingRetention: 55
Tapegroup:	310
PrimeKeys:	CarrRot, CMLon, LonHG, LatHG, LonCM
DBIndex:	CarrRot, CMLon, LonHG, LatHG, LonCM
Version:	2.1

#=====Links=====

# ===== Keyword list ===== #
# Format:
#   Keyword: <name>, link, <linkname>, <target keyword name>, <comment>
# or
#   Keyword: <name>, <datatype>, {constant | variable}, {record | segment}, 
#            <default value>, <format>, <unit>, <comment>
       
Keyword: CarrRot, int,    variable, record, -1,  %d,     NA, "Carrington rotation at MidTime"
Keyword: CMLon,   float,  slot,     record, 360, %03.0f, deg, "Longitude of central meridian at MidTime"
Keyword: LonHG,	  float,  slot,     record, NaN, %05.1f, deg, "Longitude of tracked region center"
Keyword: LatHG,	  float,  slot,     record, NaN, %+05.1f, deg, "Latitude of tracked region center"
Keyword: LonCM,   float,  slot,     record, NaN, %+05.1f,  deg, "CM (Stonyhurst) Longitude of region center at MidTime"
Keyword: MidTime, time,   variable, record, JD_0, 0,      TAI, "Midpoint of tracking interval"
Keyword: CRVAL1,  float,  variable, record, NaN, %.1f,   NA, "WCS reference point value"
Keyword: CRVAL2,  float,  variable, record, NaN, %.1f,   NA, "WCS reference point value"
Keyword: CRVAL3,  time,   variable, record, JD_0, 0,      TAI, "WCS reference point value"
Keyword: T_START, time,   variable, record, JD_0, 0,      TAI, "Start of tracking interval"
Keyword: T_STOP,  time,   variable, record, JD_0, 0,      TAI, "End of tracking interval"
Keyword: LonSpan, float,  variable, record, NaN, %.3f,   deg, "Longitude span of tracking interval"
Keyword: Coverage,float,  variable, record, 0.0000, %.4f, NA, "Duty cycle (valid images/total frames)"
Keyword: ZonalVel,float,  variable, record, NaN, %.2f, m/s, "Zonal tracking velocity at RSunRef and LatHG"
Keyword: MAI,     float,  variable, record, NaN, %.2f, G, "Magnetic Activity Index"
Keyword: Module,  string, variable, record, unknown, %s, NA, "Creation module"
Keyword: Source,  string, variable, record, unknown, %s, NA, "Input data source"
Keyword: Input,   string, variable, record, unknown, %s, NA, "Input data records"
Keyword: Created, time,   variable, record, JD_0, -1, Z, "Record creation time"
Keyword: BLD_VERS,string, variable, record, unknown, %s, NA, "JSOC library build"
Keyword: Backgrnd,string, variable, record, "", %s, NA, "Background image subtracted from data"
Keyword: RejectList,string, variable, record, "", %s, NA, "Image rejection list"
Keyword: HISTORY, string, variable, record, "", %s, NA, "Record modification history"
Keyword: MeanMU,  float,  variable, record, NaN, %.4f, NA, "Mean center-to-limb distance"
Keyword: MeanLat, float,  variable, record, NaN, %.3f, deg, "Mean latitude of mapped region"
Keyword: DATAVALS,int,    variable, record, -1, %d, NA, "Total valid values"
Keyword: MISSVALS,int,    variable, record, -1, %d, NA, "Count of missing values"
Keyword: DATAMIN, float,  variable, record, NaN, %.1f, m/s, "Minimum value"
Keyword: DATAMAX, float,  variable, record, NaN, %.1f, m/s, "Maximum value"
Keyword: DATAMEAN,double, variable, record, NaN, %.3f, m/s, "Mean value"
Keyword: DATARMS, double, variable, record, NaN, %.3f, m/s, "RMS standard deviation"
Keyword: DATASKEW,double, variable, record, NaN, %.4f, NA, "Skewness of data distribution"
Keyword: DATAKURT,double, variable, record, NaN, %.4f, NA, "Kurtosis of data distribution"
# remainder are constant for series
Keyword: WCSNAME, string, constant, record, "Carrington Heliographic/Time", %s, NA, "WCS name"
Keyword: WCSAXES, int,    constant, record, 3, %d, NA, "Number of WCS axes"
Keyword: CTYPE1,  string, constant, record, "CRLN-ARC", %s, NA, "WCS axis type"
Keyword: CTYPE2,  string, constant, record, "CRLT-ARC", %s, NA, "WCS axis type"
Keyword: CTYPE3,  string, constant, record, "TIME", %s, NA, "WCS axis type"
Keyword: CUNIT1,  string, constant, record, "deg", %s, NA, "WCS axis units"
Keyword: CUNIT2,  string, constant, record, "deg", %s, NA, "WCS axis units"
Keyword: CUNIT3,  string, constant, record, "s", %s, NA, "WCS axis units"
Keyword: CRPIX1,  float,  constant, record, 192.5, %.1f, NA, "WCS reference pixel location"
Keyword: CRPIX2,  float,  constant, record, 192.5, %.1f, NA, "WCS reference pixel location"
Keyword: CRPIX3,  float,  constant, record, 2304.5, %.1f, NA, "WCS reference pixel location"
Keyword: CDELT1,  float,  constant, record, 0.080, %.3f, deg/voxel, "WCS coordinate increment at reference point"
Keyword: CDELT2,  float,  constant, record, 0.080, %.3f, deg/voxel, "WCS coordinate increment at reference point"
Keyword: CDELT3,  float,  constant, record, 45.0, %.1f, s/voxel, "WCS coordinate increment at reference point"
Keyword: MapProj, string, constant, record, Postel, %s, NA, "Map projection"
Keyword: MapScale,float,  constant, record, 0.080, %.3f, deg/voxel, "Map scale"
Keyword: Map_PA,  float,  constant, record, 0.0, %.1f, deg, "Position angle of Carrington north wrt axis 2"
Keyword: Duration,float,  constant, record, 207360.0, %.1f, s, "Length of tracking interval"
Keyword: Cadence, float,  constant, record, 45.0, %.1f, s/voxel, "Temporal image cadence"
Keyword: Size,    float,  constant, record, 30.72, %.2f, deg, "Diameter of region (nominal)"
Keyword: Width,   float,  constant, record, 30.72, %.2f, deg, "Equatorial longitude extent of region (nominal)"
Keyword: Height,  float,  constant, record, 30.72, %.2f, deg, "Latitude extent of region (nominal)"
Keyword: ZonalTrk,float,  constant, record, 0.000000, %.6f, urad/s, "Zonal tracking rate (rel to Carrington)"
Keyword: LonDrift,float,  constant, record, 0.000, %.3f, deg, "Longitude drift over tracking interval"
Keyword: MeridTrk,float,  constant, record, 0.0, %.1f, urad/s, "Meridional tracking rate"
Keyword: MeridVel,float,  constant, record, 0.0, %.1f, m/s, "Meridional tracking velocity at RSunRef"
Keyword: LatDrift,float,  constant, record, 0.000, %.3f, deg, "Latitude drift over tracking interval"
Keyword: RSunRef, float,  constant, record, 696.0, %.1f, Mm, "Reference value of solar radius"
Keyword: Interp,  string, constant, record, "Cubic Convolution", %s, NA, "Interpolation scheme"
# prime key slotting info (hidden)
Keyword: CMLon_base, float, constant, record, 360, %.0f, deg, "CMLon index base"
Keyword: CMLon_step, float, constant, record, -30, %.0f, deg, "CMLon index step"
Keyword: LonHG_base, float, constant, record, 0.0, %.1f, deg, "LonHG index base"
Keyword: LonHG_step, float, constant, record, 15.0, %.1f, deg, "LonHG index step"
Keyword: LatHG_base, float, constant, record, 90.0, %.1f, deg, "LatHG index base"
Keyword: LatHG_step, float, constant, record, -15.0, %.1f, deg, "LatHG index step"
Keyword: LonCM_base, float, constant, record, 0.0, %.1f, deg, "LonCM index base"
Keyword: LonCM_step, float, constant, record, 15.0, %.1f, deg, "LonCM index step"
#=====Segments=====
#
# Format:
#
# Data: <name>, {constant | variable | vardim}, <type>,
#       <naxis>, <axis_0>, <axis_1>,...,<axis_{naxis-1}>, 
#       <unit>, <protocol>, <comment> 
Data: V,   variable, short, 3, 384, 384, 4608, m/s, fits, compress, 0.0, 0.5, "Tracked Data Cube"
Data: Log, variable, string, 0, NA, generic, "Tracking log"


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