AMPTE-CCE>Active Magnetospheric Particle Tracer Explorers Charge Composition Explorer

This dataset contains high time resolution MEPA rate channel data. MEPA is a particle telescope with an ION head and a TOF head. The TOF head can measure species and energy, while the ION head only measures the energy of the ions, which are mostly protons. In fact, the counts in the ION head are all assumed to be protons up to 1830 keV. The ION head has 10 energy channels, and so the first 8 channels (that are all below 1830 keV) are assumed to be all protons, and the 2 channels above this are assumed to be all alphas. The TOF head has 9 energy channels that are generic (ions of any species are counted) and some species specific channels for protons, helium, oxygen, and iron. The AMPTE data was divided into records, with each record holding data from 4 spins. In any record, all the TOF species channels are always present, but only one of either a) the 10 ION head channels or b) 9 TOF generic channels are present. The majority of records have the ION head channels. The AMPTE spacecraft had a spin period of about 6 seconds. The exact spin period varies slightly and is included in the data. MEPA data is sectored into 32 directions per spin. Nearly all channels are reported as sectored values, but to conserve telemetry, many channels are only read out every other spin, or every fourth spin. In this data, all values are summed so that they are reported every fourth spin. Note that in the original AMPTE datesets, there was a timing problem which required that 19.75 seconds (one Major Frame of telemetry) be added to time values extracted from the processing system. This correction has already been made in the particle data in this dataset.

JHUAPL is acknowledged for its role in restoring and providing AMPTE/MEPA data.

ION_protons: counts per sector (spectrogram) with each sector being a sum from 4 spins; ION records only; the time given is the SECTOR midpoint in spin 2 out of 0,1,2,3

ION_protons: counts per second per sector (spectrogram) with each sector being a sum from 4 spins; ION records only; the time given is the SECTOR midpoint in spin 2 out of 0,1,2,3

---> ION_protons: differential intensity per sector (spectrogram)

ION_protons: differential intensity per sector (spectrogram) with each sector being a sum from 4 spins; ION records only; the time given is the SECTOR midpoint in spin 2 out of 0,1,2,3

ION_protons: counts per sector (stack_plot) with each sector being a sum from 4 spins; ION records only; the time given is the SECTOR midpoint in spin 2 out of 0,1,2,3

ION_protons: counts per second per sector (stack_plot) with each sector being a sum from 4 spins; ION records only; the time given is the SECTOR midpoint in spin 2 out of 0,1,2,3

---> ION_protons: differential intensity per sector (stack_plot)

ION_protons: differential intensity per sector (stack_plot) with each sector being a sum from 4 spins; ION records only; the time given is the SECTOR midpoint in spin 2 out of 0,1,2,3

Actual ION_protons channel midpoint energies at the middle of this day

delta from lower to mid energy bound for actual channel energy range at the middle of the day for the channels in the corresponding spectrum

delta from mid to upper energy bound for actual channel energy range at the middle of the day for the channels in the corresponding spectrum

ION_helium:  counts per sector (spectrogram) with each sector being a sum from 4 spins; ION records only; the time given is the SECTOR midpoint in spin 2 out of 0,1,2,3

ION_helium: counts per second per sector (spectrogram) with each sector being a sum from 4 spins; ION records only; the time given is the SECTOR midpoint in spin 2 out of 0,1,2,3

---> ION_helium: differential intensity per sector (spectrogram)

ION_helium: differential intensity per sector (spectrogram) with each sector being a sum from 4 spins; ION records only; the time given is the SECTOR midpoint in spin 2 out of 0,1,2,3

ION_helium:  counts per sector (stack_plot) with each sector being a sum from 4 spins; ION records only; the time given is the SECTOR midpoint in spin 2 out of 0,1,2,3

ION_helium: counts per second per sector (stack_plot) with each sector being a sum from 4 spins; ION records only; the time given is the SECTOR midpoint in spin 2 out of 0,1,2,3

ION_helium: differential intensity per sector (stack_plot) with each sector being a sum from 4 spins; ION records only; the time given is the SECTOR midpoint in spin 2 out of 0,1,2,3

Actual ION_helium channel midpoint energies at the middle of this day

Micro-channel plate 1:  count rate from counts summed over 4 spins

Micro-channel plate 2: count rate from counts summed over 4 spins

Micro-channel plate 3: count rate from counts summed over 4 spins

Solid state detector: count rate from counts summed over 4 spins

TOF_protons: counts per sector (spectrogram) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

TOF_protons: counts per second per sector (spectrogram) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

---> TOF_protons: differential intensity per sector (spectrogram)

TOF_protons: differential intensity per sector (spectrogram) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

TOF_protons: counts per sector (stack_plot) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

TOF_protons: counts per second per sector (stack_plot) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

---> TOF_protons: differential intensity per sector (stack_plot)

TOF_protons: differential intensity per sector (stack_plot) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

Actual TOF_protons channel midpoint energies at the middle of this day

TOF_helium: counts per sector (spectrogram) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

TOF_helium: counts per second per sector (spectrogram) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

---> TOF_helium: differential intensity per sector (spectrogram)

TOF_helium: differential intensity per sector (spectrogram) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

TOF_helium: counts per sector (stack_plot) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

TOF_helium: counts per second per sector (stack_plot) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

TOF_helium: differential intensity per sector (stack_plot) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

Actual TOF_helium channel midpoint energies at the middle of this day

TOF_oxygen: counts per sector (spectrogram) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

TOF_oxygen: counts per second per sector (spectrogram) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1  midpoint in spin 2 out of 0,1,2,3

---> TOF_oxygen: differential intensity per sector (spectrogram)

TOF_oxygen: differential intensity per sector (spectrogram) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1  midpoint in spin 2 out of 0,1,2,3

TOF_oxygen: counts per sector (stack_plot) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

TOF_oxygen: counts per second per sector (stack_plot) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1  midpoint in spin 2 out of 0,1,2,3

TOF_oxygen: differential intensity per sector (stack_plot) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1  midpoint in spin 2 out of 0,1,2,3

Actual TOF_oxygen channel midpoint energies at the middle of this day

TOF_iron: counts per sector (spectrogram) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

TOF_iron: counts per second per sector (spectrogram) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

TOF_iron: differential intensity per sector (spectrogram) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

TOF_iron: counts per sector (stack_plot) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

TOF_iron: counts per second per sector (stack_plot) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

TOF_iron: differential intensity per sector (stack_plot) with each sector being a sum from 4 spins; either ION or TOF records; the time given is the SECTOR_1 midpoint in spin 2 out of 0,1,2,3

Actual TOF_iron channel midpoint energies at the middle of this day

TOF_all_ions: counts per sector (spectrogram) with each sector being a sum from 4 spins; TOF records only; the time given is the SECTOR_2 midpoint in spin 2 out of 0,1,2,3

TOF_all_ions: counts per second per sector (spectrogram) with each sector being a sum from 4 spins; TOF records only; the time given is the SECTOR_2 midpoint in spin 2 out of 0,1,2,3

---> TOF_all_ions: differential intensity per sector (spectrogram)

TOF_all_ions: differential intensity per sector (spectrogram) with each sector being a sum from 4 spins; TOF records only; the time given is the SECTOR_2 midpoint in spin 2 out of 0,1,2,3

TOF_all_ions: counts per sector (stack_plot) with each sector being a sum from 4 spins; TOF records only; the time given is the SECTOR_2 midpoint in spin 2 out of 0,1,2,3

TOF_all_ions: counts per second per sector (stack_plot) with each sector being a sum from 4 spins; TOF records only; the time given is the SECTOR_2 midpoint in spin 2 out of 0,1,2,3

---> TOF_all_ions: differential intensity per sector (stack_plot)

TOF_all_ions: differential intensity per sector (stack_plot) with each sector being a sum from 4 spins; TOF records only; the time given is the SECTOR_2 midpoint in spin 2 out of 0,1,2,3

HIRES_ION_protons: counts for every sector in every spin (spectrogram); ION records only; the time given is the midpoint of SECTOR_3

---> HIRES_ION_protons: counts per second for every sector in every spin (spectrogram)

HIRES_ION_protons: counts per second for every sector in every spin (spectrogram); ION records only; the time given is the midpoint of SECTOR_3

---> HIRES_ION_protons: differential intensity for every sector in every spin (spectrogram)

HIRES_ION_protons: differential intensity for every sector in every spin (spectrogram); ION records only; the time given is the midpoint of SECTOR_3

HIRES_ION_protons: counts for every sector in every spin (stack_plot); ION records only; the time given is the midpoint of SECTOR_3

---> HIRES_ION_protons: counts per second for every sector in every spin (stack_plot)

HIRES_ION_protons: counts per second for every sector in every spin (stack_plot); ION records only; the time given is the midpoint of SECTOR_3

---> HIRES_ION_protons: differential intensity for every sector in every spin (stack_plot)

HIRES_ION_protons: differential intensity for every sector in every spin (stack_plot); ION records only; the time given is the midpoint of SECTOR_3

Actual HIRES_ION_protons channel midpoint energies at the middle of this day

Spacecraft spin axis as a unit vector in GSE evaluated once per record