MAPSview - MAPS Key Parameter File Formats
MAPS Key Paramter data files conform to the following conventions.
Basic Properties
Filenames
Time
Cadence
Individual Instruments
Basic Properties of Files
Each file contains ASCII data for a single day. In addition, for each data file there may be a companion label file with all header and unit information. Most instruments will contribute data at 1 minute intervals. However, some instruments, such as CAPS, will contribute additional processed data at 5 minute intervals. Files are fixed width, space delimited.
Filename
INST_SENS_YYYYDDD_V.TAB
The naming convention for files in the MKP database includes a 4 character instrument name, a 4 character sensor name followed by the year and day. The final character before the .TAB extensionis a version number which in incremented due to datafile updates.
Time In Files
YYY-DOYT00:00:00.000
Time in the files will be given in SCET UTC in the above format.
Cadence
For all instruments, data will be provided at 1 minute centers (Δt) with each point representing an average of the data over that minute. The data begins in each file with a point at time 00:00:30.000 SCET with the average running from 00:00:00 to 00:01:00. Subsequent points are time stamped at the center of the interval ((n-1/2)Δt) with the final point at 1/2Δt less than 24:00:00. Each point represents an average over the time period (n-1)Δt to nΔt. Each file will therefore contain 1440 lines (or less if data points are missing).
For some instruments, CAPS and MIMI for example, higher level data products such as moments of the distribution function (density, velocity) will be provided. These cannot be provided at the 1 minute cadence due to spacecraft motion and instrument articulation. These instrument may provide file with data at a 5 minute cadence. The first data point will cover the time from 00:00:00 to 00:05:00 and will be time stamped at 00:02:30 which is the center of the interval. This way the time stamp will correspond to a data point in the 1 minute files.
Individual Instrument Data Descriptions