HMI_Logo HMI Ring Diagrams
Pipeline Data Series Specifications

averages – (ring diagram) background averages

Data Series class
averages of (untracked, unmapped) data
Data Series included
Individual Data Series notes
On 18 January 2011 the series hmi.V_avg120 was modified to change: All records created before that date used the old values of the segment types and scaling defaults. (Modifications to the datavg module just prior to that date mean that records subsequently created may have been created with scalings overriding the new defaults.) Affected data with the old types and scalings are in the Carrington time range 2100:300 – 2102:060.

Records hmi.V_avg120[2096-2125] used values of CROTA2 in the input data that were subsequently modified by subtraction of 0°.07 (going from a nominal 180° to 179°.93). The corresponding values of CROTA2 in hmi.V_avg120 have not (yet) been modified.

On 17 October 2012 the series hmi.V_avg120 was modified to add a generic Log segment to record information about the input records as supported by datavg v 1.2

Module datavg versions used in producing definitive data, by Carrington time:

Data Record organization
Individual records correspond to the averages of the input data images for the record interval comprehended by the prime key values.

Data Segments
The data segments are expected to include up to three segments of the same form as those of the input records, stored as either bin or fits protocol files, to contain the mean, the variance and the count of valid values, respectively, although the scaling and offset values are likely to be different from one another and those of the mean from those of the input records. In particular, the data for the variance and count should be offset for maximum precision, as no negative values are possible. (unless the variance/power is represented as its log!). An additional generic protocol segment is optional; if present, it may be used to record textual information about the input records processed. For a discussion of the various segment protocols, see segments.

Prime Keywords and slotting 
name        type   value  format  unit  comment

CarrRot     int           %d      —     Carrington rotation at MidTime
CMLon       float         %03.0f  deg   Longitude of central meridian at MidTime

CMLon_base  float  360.0  %.1f    deg   CMLon index base
CMLon_step  float  -60.0  %.1f    deg   CMLon index step
Sample JSOC Series Definition 
#=====General Series Information=====
Seriesname:      	hmi.V_avg120
Description:		"Temporal averages of HMI Vgrams over 1/3 CR"
Author:          	"Rick Bogart"
Archive:         	1
Unitsize:		1
Retention:       	1800
Tapegroup:       	1
PrimeKeys:       	CarrRot, CMLon

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

#=====Keywords=====

Keyword: CarrRot,  int,    variable, record, -1,  %d,     "", "Carrington rotation at MidTime"
Keyword: CMLon,    float,  slot,     record, 360, %03.0f, deg, "Longitude of central meridian at MidTime"

Keyword: CRPIX1,   float,  variable, record, NaN, %.3f, pixel, "Average WCS reference pixel location"
Keyword: D_CRPIX1, float,  variable, record, NaN, %.3f, pixel, "RMS of  WCS reference pixel location"
Keyword: CRPIX2,   float,  variable, record, NaN, %.3f, pixel, "Average WCS reference pixel location"
Keyword: D_CRPIX2, float,  variable, record, NaN, %.3f, pixel, "RMS of  WCS reference pixel location"
Keyword: CDELT1,   float,  variable, record, NaN, %.6f, arcsec/pixel, "Average WCS coordinate increment at reference point"
Keyword: D_CDELT1, float,  variable, record, NaN, %.6f, arcsec/pixel, "RMS of  WCS coordinate increment at reference point"
Keyword: CDELT2,   float,  variable, record, NaN, %.6f, arcsec/pixel, "Average WCS coordinate increment at reference point"
Keyword: D_CDELT2, float,  variable, record, NaN, %.6f, arcsec/pixel, "RMS of  WCS coordinate increment at reference point"
Keyword: CROTA2,   float,  variable, record, NaN, %.3f, deg, "Average WCS rotational angle"
Keyword: D_CROTA2, float,  variable, record, NaN, %.3f, deg, "RMS of  WCS rotational angle"
Keyword: T_OBS,    time,   variable, record, JD_0, -1, TAI, "Average of observation time"
Keyword: D_T_OBS,  float,  variable, record, NaN, %.0f, s, "RMS of observation time"
Keyword: MidTime,  time,   variable, record, JD_0, -1,  TAI, "Midpoint of averaging interval"
Keyword: DataRecs, int,    variable, record, 0, %d, NA, "Number of valid input records"
Keyword: MissRecs, int,    variable, record, 0, %d, NA, "Number of skipped input records"
Keyword: Quality,  int,    variable, record, 0x00000000, %08x, NA, "Data Quality flag"
Keyword: MeanMIN,  float,  variable, record, nan, %.1f, m/s, "Minimum value in Mean image"
Keyword: MeanMAX,  float,  variable, record, nan, %.1f, m/s, "Maximum value in Mean image"
Keyword: MeanAVG,  float,  variable, record, nan, %.2f, m/s, "Mean value of Mean image"
Keyword: MeanRMS,  float,  variable, record, nan, %.2f, m/s, "RMS value of Mean image"
Keyword: MeanSKEW, float,  variable, record, nan, %.3f, "", "Skewness of Mean image values"
Keyword: MeanKURT, float,  variable, record, nan, %.3f, "", "Kurtosis (of Mean image values"
Keyword: PowrMIN,  float,  variable, record, nan, %.3e, m2/s2, "Minimum value in Power image"
Keyword: PowrMAX,  float,  variable, record, nan, %.3e, m2/s2, "Maximum value in Power image"
Keyword: PowrAVG,  float,  variable, record, nan, %.3e, m2/s2, "Mean value of Power image"
Keyword: PowrRMS,  float,  variable, record, nan, %.3e, m2/s2, "RMS value of Power image"
Keyword: PowrSKEW, float,  variable, record, nan, %.3f, "", "Skewness of Power image values"
Keyword: PowrKURT, float,  variable, record, nan, %.3f, "", "Kurtosis (of Power image values"
Keyword: CountMIN, int,    variable, record, -1, %d, "", "Minimum value in Count image"
Keyword: CountMAX, int,    variable, record, -1, %d, "", "Maximum value in Count image"
Keyword: OBS_VR,   double, variable, record, NaN, %.3f, m/s, "Average observer heliocentric radial velocity"
Keyword: D_OBS_VR, double, variable, record, NaN, %.3f, m/s, "RMS of observer heliocentric radial velocity"
Keyword: OBS_VW,   double, variable, record, NaN, %.2f, m/s, "Average observer heliocentric westward in plane of Carrington equator velocity"
Keyword: D_OBS_VW, double, variable, record, NaN, %.2f, m/s, "RMS of observer heliocentric westward in plane of Carrington equator velocity"
Keyword: OBS_VN,   double, variable, record, NaN, %.3f, m/s, "Average observer heliocentric northward velocity wrt Carrington"
Keyword: D_OBS_VN, double, variable, record, NaN, %.3f, m/s, "RMS of observer heliocentric northward velocity wrt Carrington"
Keyword: DSUN_OBS, double, variable, record, NaN, %12.5e, m, "Average observer heliocentric distance"
Keyword: D_DSUN_OBS,double,variable, record, NaN, %12.5e, m, "RMS of observer heliocentric distance"
Keyword: CRLN_OBS, float,  variable, record, NaN, %.2f, deg, "Average observer Carrington longitude"
Keyword: D_CRLN_OBS, float,variable, record, NaN, %.2f, deg, "RMS of observer Carrington longitude"
Keyword: CRLT_OBS, float,  variable, record, NaN, %.2f, deg, "Average observer heliographic latitude"
Keyword: D_CRLT_OBS, float,variable, record, NaN, %.2f, deg, "RMS of observer heliographic latitude"
Keyword: RSUN_OBS, float,  variable, record, NaN, %.2f, arcsec, "Average solar angular radius"
Keyword: D_RSUN_OBS, float,variable, record, NaN, %.2f, arcsec, "RMS of solar angular radius"
Keyword: T_FIRST,  time,   variable, record, JD_0, 0, TAI, "Earliest time in input data"
Keyword: T_LAST,   time,   variable, record, JD_0, 0, TAI, "Latest time in input data"
Keyword: Module,   string, variable, record, "", %s, NA, "Creation module"
Keyword: BLD_VERS, string, variable, record, "", %s, NA, "JSOC library build version"
Keyword: Source,   string, variable, record, "", %s, NA, "Source DRMS data series"
Keyword: Input,    string, variable, record, "", %s, NA, "Input DRMS dataset specification"
Keyword: Created,  time,   variable, record, JD_0, -1, Z, "Record creation time"
Keyword: HISTORY,  string, variable, record, "", %s, NA, "Record modification history"

Keyword: WCSNAME,  string, constant, record, "Helioprojective-cartesian", %s, NA, "WCS name"
Keyword: WCSAXES,  int,    constant, record, 2, %d, "", "Number of WCS axes"
Keyword: CTYPE1,   string, constant, record, HPLN-TAN, %s, NA, "WCS axis type"
Keyword: CTYPE2,   string, constant, record, HPLT-TAN, %s, NA, "WCS axis type"
Keyword: CUNIT1,   string, constant, record, arcsec, %s, NA, "WCS axis units"
Keyword: CUNIT2,   string, constant, record, arcsec, %s, NA, "WCS axis units"
Keyword: CRVAL1,   float,  constant, record, 0.000, %.3f, arcsec, "WCS reference point value"
Keyword: CRVAL2,   float,  constant, record, 0.000, %.3f, arcsec, "WCS reference point value"
Keyword: Interval, float,  constant, record, 120.0, %.1f, deg, "Averaging interval in units of Carrington rotation"
Keyword: TELESCOP, string, constant, record, SDO/HMI, %s, NA, "Telescope used to acquire the data"
Keyword: WAVELNTH, float,  constant, record, 6173.0, %.1f, Å, "Observing wavelength"
Keyword: ORIGIN,   string, constant, record, "SDO/JSOC-SDP", %s, NA, "Organization creating the record"
Keyword: RSunRef,  float,  constant, record, 696.0, %.1f, Mm, "Reference value of solar radius"

# prime key slotting info (hidden)

Keyword: CMLon_base, float, constant, record, 360.0, %.1f, deg, "CMLon index base"
Keyword: CMLon_step, float, constant, record, -60.0, %.1f, deg, "CMLon index step"

#=====Segments=====

Data: mean,  variable, short, 2, 4096, 4096, m/s,   fits, "compress Rice", 0.0, 0.25, "Doppler mean"
Data: power, variable, short, 2, 4096, 4096, m2/s2, fits, "compress Rice", 327670.0,  10.0, "Doppler power"
Data: valid, variable, short, 2, 4096, 4096, NA,    fits, "", 32767.0, 1.0, "valid pixel count"
Data: Log,   variable, char,  0, NA, generic, "run log"
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