Prime Keys are: T_START is slotted 'ts_slot' using T_START_index LMIN LMAX NDT DB Index Keys are: T_START_index LMIN LMAX NDT All Keywords for series hmi.V_sht_modes: T_START (time) beginning of time period T_START_step (float) T_START step, =1d T_START_unit (string) T_START step unit T_START_epoch (time) beginning of slot 0 (MDI epoch) T_START_round (float) = T_STEP LMIN (int) minimum spherical harmonic degree LMAX (int) maximum spherical harmonic degree NDT (int) number of points in timeseries T_STOP (time) beginning of following time period T_OBS (time) midpoint of timeseries, =(T_START+T_STOP)/2 DATE (time) time the record was last updated, ISO format QUALITY (int) bitfield specifying various aspects of data quality, see ??? MAPMMAX (int) maximum m for remapping dopplergrams SINBDIVS (int) number of increments in sin latitude for remapping dopplergrams MFLIPPED (int) sign convention for m: 0 for MDI, 1 for GONG T_STEP (float) time step TELESCOP (string) source telescope for data, SDO=Solar Dynamics Observatory INSTRUME (string) source instrument, HMI=Helioseismic and Magnetic Imager ORIGIN (string) location of data processing, JSOC=Joint Science Operations Center, at Stanford WAVELNTH (int) wavelength of observation, 6173.3 Angstroms, Fe I photospheric absorption line VERSION (string) version of data, used for retrieving obsolete versions CALVER64 (longlong) calibration version Segments for series hmi.V_sht_modes: m6 none generic 6 a-coeffient fits m18 none generic 18 a-coeffient fits m36 none generic 36 a-coeffient fits Links for series hmi.V_sht_modes: HISTORY STATIC hmi.globalhs_history processing history