Time Standard
Time in all FPI data products mark the beginning of the data interval. In other MMS data products, the time may mark the middle of the data interval. FPI data products after v1.0 include both the time and a "delta +/-" to indicate the time relative to the data interval. That is, for FPI the delta +/- is [10,0] sec for the SITL data product or [0.03, 0] sec for a DES burst product. It is important for users to understand the time conventions of each data product used especially when comparing data sets.
SPEDAS code to shift FPI moments to "centered-time".
var_dis=['Ni','Ti_para_l2','Ti_perp_l2','vi']
FOR i=0, n_elements(var_dis)-1 DO BEGIN
get_data,var_dis(i),data=d
store_data,var_dis(i),data={x:d.x+0.075d,y:d.y}; shift FPI data to center time
ENDFOR
var_des=['Ne','Te_para_l2','Te_perp_l2','ve']
FOR i=0, n_elements(var_des)-1 DO BEGIN
get_data,var_des(i),data=d
store_data,var_des(i),data={x:d.x+0.015d,y:d.y}; shift FPI data to center time
ENDFOR
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OR:
mms_load_fpi, /time_clip, trange=trange,probes=sc_num, datatype='dis-moms', level=fpi_level, data_rate=fpidatarate, versions=versions, /center_measurement
mms_load_fpi, /time_clip, trange=trange,probes=sc_num, datatype='des-moms', level=fpi_level, data_rate=fpidatarate, versions=versions, /center_measurement
File Versions
The version number within each FPI CDF file name is of the format vX.Y.Z. General MMS guidelines are summarized here, with along with notes of how the FPI specifically interprets these guidelines.
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