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Numerical data may be downloaded in various formats, which are described below.


ASCII data with a human readable file. Not always the easiest to parse by computer but self-explanatory. The data is separated from the header by a blank line. For riometer beam data and magenetometer data each line starts with the time (year, month day, hour, minute and seconds).


Two versions of Matlab data are available. If you are using MIA you should select "Matlab format, MIA object", otherwise select the struct version.

Matlab format, MIA object

An object (or an array of objects) containing data from the selected instrument(s). MIA objects may be loaded without the MIA toolbox but warnings will be given for the unknown classes, and object will be converted into structs. All metadata from MIA is preserved.

Matlab format, struct

A struct (or an array of structs) containing data from the selected instrument(s). Data is saved in a field called data. Important metadata is preserved in the remaining fields. The struct field names should be self-explantory.


Deprecated. This format will be withdrawn. We are currently investigating which standard formats are suitable replacements.

An ASCII format used only for SAMNET data, sometimes compressed with gzip. The exact format varies according to the data archive selected. 5s resolution data files have a record header every hour, on the hour and store 1 day of data; if compressed the extension is .dgz. 1s resolution data files have a record header every minute, on the minute, store 1 hour of data and if compressed the extension is .gz. Note that these files are exact copies of the data archive files, the SAMNET ASCII files will not processed (filtered, change of temporal resolution etc.) regardless of what you requested. Other numerical data formats do honour the processing stages requested and will reflect numerical data used for the plotting routines.

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