| Summary: | The 137 files in this directory contain all South Pole Station data required to reproduce the results of LaBelle et al. [2021] "Cluster satellite and South Pole Station ground-based measurements of escaping and leaked Auroral Kilometric Radiation." (Cluster satellite data used in this paper are available at the Cluster Science Archive, URL www.cosmos.esa.int/web/csa.) There are two types of files: 1) The first type of file (10 files) has file name pattern YYYYMMDD-000001-SPS-.data.binary.gray.gz where YYYY is the year (2019 or 2020 for all of the data in this set), MM is the month, and DD is the day; and SPS stands for South Pole Station, the site where the data were recorded. Each file covers the time interval 0000-0600 UT on the date encoded in the file name. When unzipped, each file has this format: sets of 8193 lines, each corresponding to a power spectrum; the first line in each set of 8193 lines is time of that spectrum in format HH:MM:seconds (on the date encoded in the filename), and lines 2-8193 in each set of 8193 lines are the relative powers in decibels corresponding to evenly spaced frequency bins ranging from 0-5000 kHz. These power spectra were obtained from analysis of signals from a 10 square-meter antenna in the science sector at South Pole Station, sampled at 10 MHz and analyzed by taking 16384-point FFTs each 0.2 seconds with Hanning window applied. The time in this file is kept exact to within a fraction of a millisecond by using the South Pole server. 2) The second type of files (127 files) has file name pattern YYYYMMDD-HHMMSS-HHMMSS-SP-USRP-CHX.gz where YYYY is the year (2018, 2019 or 2020 for all of the data in this set), MM is the month, and DD is the day; the first HHMMSS gives the time of the first spectrum in the file in hours minutes seconds; the second HHMMSS gives the time of the last spectrum in the file in hours minutes seconds; SP stands for the site where the data were recorded (SP for South Pole for all of the data in this set), and X indicates which antenna the data are from (1 or 2). When unzipped, each file covers a time interval of 1-4 minutes. The data consist of a string of two-byte unsigned integers, alternately I and Q samples of data from one of two 40 square meter loop antennas, indicated in the file name, oriented perpendicular to each other on a 30-foot mast in the science sector at South Pole Station. The sample rate is 2 MHz and the center frequency is 1 MHz, so the data correspond to the bandwidth 0-2 MHz. The timing of the samples is estimated by dead reckoning through the file, using the start and end times encoded in the file name. The timing can drift by up to 1-2 seconds within the file; exact timing is obtained by correlating these data with the data in the other type of file, described above, which has exact timing. The IQ data in these files are calibrated. Taking a 2048 Fourier transform of the data yields a power spectrum which, when converted to decibels (10 log Power), 0 dB corresponds to an rms signal level of 65 mV/m.
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