Users should acknowledge the sources of data used in all publications, presentations, and reports using an appropriate DOI. Appropriate acknowledgement to institutions, personnel, and funding agencies should be given, including acknowledging the IMAP Mission Principal Investigator, Prof. David J. McComas of Princeton University (Contract #80GSFC19C0027). IMAP Rules-of-the-Road for data usage can be found in the IMAP CMAD. 

All IMAP data products are publicly released and citable for use in publications. Please consult the IMAP team publications and personnel for further details on production, processing, and usage of these data. 

The Interstellar Dust Experiment (IDEX) is a time-of-flight (TOF) dust impact ionization mass spectrometer on the IMAP mission that provides the elemental composition, speed, and mass distributions of interstellar dust and interplanetary dust particles. Each record contains the data from a single dust impact. See https://imap.princeton.edu/spacecraft/instruments/interstellar-dust-experiment-idex for more details. 

Cartesian coord X positions for the IMAP spacecraft in the ECLIPJ2000 frame.

Cartesian coord Y positions for the IMAP spacecraft in the ECLIPJ2000 frame.

Cartesian coord Z positions for the IMAP spacecraft in the ECLIPJ2000 frame.

Velocity X positions for the IMAP spacecraft in the ECLIPJ2000 frame.

Velocity Y positions for the IMAP spacecraft in the ECLIPJ2000 frame.

Velocity Z positions for the IMAP spacecraft in the ECLIPJ2000 frame.

Longitude of the dust event as observed from Earth in the ECLIPJ2000 frame.

Latitude of the dust event as observed from Earth in the ECLIPJ2000 frame.

The low sample rate is 4.0625 MHz, so adjacent samples are separated by approximately 1/4.0625 microseconds.

The high sample rate in microseconds. Steps are approximately 1/260 microseconds in duration. Used by the TOF_High, TOF_Mid, and TOF_Low variables.

Parameters include time of impact, constant offset, amplitude, rise time, discharge time.

Total charge from the dust impact on Target Low (TL) channel derived from the fitted curve.

Estimated particle velocity from Target Low signal based on impact charge.

Estimated dust mass from Target Low signal based on impact charge.

Charge from the dust impact on Target High (TH) derived from the fitted curve.

Estimated particle velocity from Target High signal based on impact charge.

Estimated dust mass from Target High signal based on impact charge.

Charge from the dust impact on Ion Grid (IG) channel derived from the fitted curve.

Estimated particle velocity from Ion Grid signal based on impact charge.

Estimated dust mass from Ion Grid signal based on impact charge.

Mass-scale output retained for compatibility with the L2A product structure.

Mass-scale output retained for compatibility with the current L2A product structure. This variable is not intended to be the primary science-facing mass-scale output.

Kappa measures how closely detected TOF peaks align with integer mass positions on the preliminary mass scale.

Parameters include time_of_impact, constant_offset, amplitude, rise_time, discharge_time.

Time, number of nanoseconds since J2000 with leap seconds included


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