DOI: 10.48322/jr67-ar66
title: IBEX High Energy Neutral Atom Imager (ENA-Hi) Data Release 13, Compton-Getting corrected, not Survival Probability corrected, Ram direction, West Longitude Ecliptic Maps, 1 year averaged data, Level H3 (H3), annually averaged Data

description: The IBEX ENA-Hi data sets are from Release 13 of all-sky map data for the first ten years, 2009-2018, in the form of ram direction Hydrogen, H, energetic neutral atom fluxes with Compton-Getting corrections for spacecraft motion and with no corrections for ENA survival probability between 1 and 100 AU. All-sky maps have been compiled for the whole 1 yr time interval. The Interstellar Boundary Explorer, IBEX, has operated in space since 2008 updating our knowledge of the outer heliosphere and its interaction with the local interstellar medium. Start-time: 2008-12-25. There are currently 14 releases of IBEX ENA-Hi and/or IBEX ENA-Lo data covering 2009-2018. The data consist of all-sky maps in Solar Ecliptic Longitude, east and west, and Latitude angles for Energetic Neutral Atom, ENA, Hydrogen fluxes from either IBEX ENA-Hi from energy band 2 through energy band 6, see the first table below, or from IBEX ENA-Lo from energy band 5 through energy band 8, see the second table below. Details of the data and enabled science from Release 13 are given in the following journal publications that describe the 1-yr data results and the IBEX-Hi and IBEX-Lo Instruments: McComas, D.J., et al. (2018), Heliosphere Responds to a Large Solar Wind Intensification: Decisive Observations from IBEX, Astrophys. J. Lett., 856(1), L10, (6 pp.), http://doi.org/10.3847/2041-8213/aab611 Funnsten, H.O., et al. (2009), The Interstellar Boundary Explorer High Energy (IBEX-Hi) Neutral Atom Imager, Space Sci. Rev., 146, 75-103, https://doi.org/10.1007/s11214-009-9504-y Fuselier, S.A., et al. (2009), The IBEX-Lo Sensor, Space Sci. Rev., 146, 117-147, https://doi.org/10.1007/s11214-009-9495-8 The IBEX ENA-Hi band/channel center energies and full width half maximum, FWHM, energy ranges are listed in a table below: +-----------------------------------------------------+   Energy Band   Center Energy   Energy Range    -----------------------------------------------------    Channel 2   ~0.71 keV   0.52 keV to 0.95 keV     Channel 3   ~1.11 keV   0.84 keV to 1.55 keV     Channel 4   ~1.74 keV   1.36 keV to 2.50 keV     Channel 5   ~2.73 keV   1.99 keV to 3.75 keV     Channel 6   ~4.29 keV   3.13 keV to 6.00 keV   +-----------------------------------------------------+ The IBEX ENA-Lo band/channel center energies are listed in a table below: +-----------------------------+   Energy Band   Center Energy    -----------------------------    Channel 1   0.015 keV     Channel 2   0.029 keV     Channel 3   0.055 keV     Channel 4   0.110 keV     Channel 5   0.209 keV     Channel 6   0.439 keV     Channel 7   0.872 keV     Channel 8   1.821 keV   +-----------------------------+ This particular IBEX-Hi CDF data product was constructed from the original ascii files named using the pattern hvset_noSP_ram_cg_yearN for N=1,10, includes pixel map data from the ram direction, with corrections, cg, for the Compton-Getting effect no corrections, nosp, for ENA survival probability between 1 AU and 100 AU, and a map compilation cadence equal to one year. In all, there are two IBEX ENA-Hi Release 13 CDF data products with one Compton-Getting correction setting, two survival probability settings, and one directional setting: ram. The table below defines how the file naming pattern is constructed for the two data products. Note that "ibex_h3_ena_hi_r13" is the file naming pattern root for these IBEX ENA-Hi CDF data products. The asterisk symbols in the last column of the table shows the line corresponding to this CDF data product within the expanded file naming pattern schema. +---------------------------------------------------------------------------------------------------+   C-G Corr.   SP Corr.   Dir. Acronym   ENA Hi/Lo   File Naming Pattern for 1 yr Skymaps      ---------------------------------------------------------------------------------------------------    cg   nosp   ram   ENA Hi   ibex_h3_ena_hi_r13_cg_nosp_ram_1yr   ***     cg   sp   ram   ENA Hi   ibex_h3_ena_hi_r13_cg_sp_ram_1yr     +---------------------------------------------------------------------------------------------------+ The first column in the above table shows whether Compton-Getting, C-G, corrections have been applied to the data. C-G corrections account for how ENA measurements are affected by the the orientation of the IBEX spacecraft velocity vector relative to the arrival direction of the ENAs. * cg: Compton-Getting corrections applied * nocg: Compton-Getting corrections not applied The second column in the above table shows whether Survival Probability, SP, corrections have been applied to the data. SP corrections account for the loss of ENAs due to radiation pressure, photoionization and ionization via charge exchange with solar wind protons as they stream through the heliosphere. This correction scales the data out from IBEX at 1 AU to ~100 AU. In the original data this mode is denoted as Tabular. * sp: Survival Probability corrections applied * nosp: Survival Probability corrections not applied The third column in the above table shows the constraint placed on the ENA arrival direction relative to spacecraft motion used in the construction of each of the various IBEX ENA-Hi and IBEX ENA-Lo Skymaps. * omni: All data, no Constraint on the IBEX velocity vector relative to the ram direction of incoming ENAs * ram: Data constrained to times when the IBEX velocity vector pointed into the ram direction of the incoming ENAs * antiram: Data constrained to times when the IBEX velocity vector pointed away from the ram direction of the incoming ENAs The data in IBEX Release 13 are separated into 1 year segments. The following table shows the association between Release 13 map numbers from 1 to 20 with mission year from 1 to 10, orbits from 11 to 431b, and dates from 2008-12-25 to 2018-12-26. +-------------------------------------------------------------------------+   Skymap #   Year   Start-End of Orbit or Arcs   Start Date to Stop Date    -------------------------------------------------------------------------    1   1   11-34   2008-12-25 to 2009-06-25     2   1   35-58   2009-06-25 to 2009-12-25     3   2   59-82   2009-12-25 to 2010-06-26     4   2   83-106   2010-06-26 to 2010-12-26     5   3   107-130a   2010-12-26 to 2011-06-25     6   3   130b-150a   2011-06-25 to 2011-12-24     7   4   150b-170a   2011-12-24 to 2012-06-22     8   4   170b-190b   2012-06-22 to 2012-12-26     9   5   191a-210b   2012-12-26 to 2013-06-26     10   5   211a-230b   2013-06-26 to 2013-12-26     11   6   231a-250b   2013-12-26 to 2014-06-26     12   6   251a-270b   2014-06-26 to 2014-12-24     13   7   271a-290b   2014-12-24 to 2015-06-24     14   7   291a-310b   2015-06-24 to 2015-12-23     15   8   311a-330b   2015-12-24 to 2016-06-23     16   8   331a-351a   2016-06-24 to 2016-12-26     17   9   351b-371a   2016-12-26 to 2017-06-25     18   9   371b-391a   2017-06-25 to 2017-12-25     19   10   391a-411b   2017-12-25 to 2018-06-28     20   10   412a-431b   2018-06-29 to 2018-12-26   +-------------------------------------------------------------------------+