IBEX High Energy Neutral Atom Imager (ENA-Hi) Data Release 10, Compton-Getting corrected, not Survival Probability corrected, Ram direction, West Longitude Ecliptic Maps, Level H3 (H3), 7 year average Data

The IBEX ENA-Hi and IBEX ENA-Lo data sets are from Release 10 of all-sky map data for the first seven years, 2009-2015, 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 7 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 2009-2017. 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 10 are given in the following journal publications that describe the 7-yr data results and the IBEX-Hi and IBEX-Lo Instruments: McComas, D.J., et al. (2017), Seven Years of Imaging the Global Heliosphere with IBEX, Astrophys. J. Supp. Ser., 229(2), 41 (32 pp.), http://doi.org/10.3847/1538-4365/aa66d8 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=1,7, 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 seven year. In all, there are 12 IBEX ENA-Hi and IBEX ENA-Lo Release 10 CDF data products resulting from the existing combinations of options for ENA-Hi and ENA-Lo, two Compton-Getting correction settings by two survival probability settings by three directional settings: antiram, ram, omni. The table below defines how the file naming pattern is constructed for each data product. Note that "ibex_h3_ena_hi_r10" is the file naming pattern root for all ten of these IBEX ENA-Hi CDF data products while "ibex_h3_ena_lo_r10" is the file naming pattern root for the two of these IBEX ENA-Lo 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 7 yr Skymaps --------------------------------------------------------------------------------------------------- cg nosp antiram ENA Hi ibex_h3_ena_hi_r10_cg_nosp_antiram_7yr cg sp antiram ENA Hi ibex_h3_ena_hi_r10_cg_sp_antiram_7yr nocg nosp antiram ENA Hi ibex_h3_ena_hi_r10_nocg_nosp_antiram_7yr nocg sp antiram ENA Hi ibex_h3_ena_hi_r10_nocg_sp_antiram_7yr --------------------------------------------------------------------------------------------------- cg nosp ram ENA Hi ibex_h3_ena_hi_r10_cg_nosp_ram_7yr *** cg sp ram ENA Hi ibex_h3_ena_hi_r10_cg_sp_ram_7yr --------------------------------------------------------------------------------------------------- cg nosp omni ENA Hi ibex_h3_ena_hi_r10_cg_nosp_omni_7yr cg sp omni ENA Hi ibex_h3_ena_hi_r10_cg_sp_omni_7yr nocg nosp omni ENA Hi ibex_h3_ena_hi_r10_nocg_nosp_omni_7yr nocg sp omni ENA Hi ibex_h3_ena_hi_r10_nocg_sp_omni_7yr --------------------------------------------------------------------------------------------------- nocg nosp omni ENA Lo ibex_h3_ena_lo_r10_nocg_nosp_omni_7yr nocg sp omni ENA Lo ibex_h3_ena_lo_r10_nocg_sp_omni_7yr +---------------------------------------------------------------------------------------------------+ 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 10 are separated into 6 month and 1 year segments. The following table shows the association between Release 10 map numbers from 1 to 14 with mission year from 1 to 7, orbits from 11 to 310b, and dates from 2008-12-25 to 2015-12-23. +-------------------------------------------------------------------------+ 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 +-------------------------------------------------------------------------+

本数据集包含星际边界探测器（Interstellar Boundary Explorer, IBEX）的ENA-Hi与ENA-Lo两类数据，对应2009—2015年首七年观测的全天成像图数据第10版发布内容，数据形式为迎风方向的氢原子（Hydrogen, H）高能中性原子（Energetic Neutral Atom, ENA）通量，已针对航天器运动施加康普顿-格林（Compton-Getting, C-G）修正，且未对1—100 AU区间内的ENA存活概率进行修正。本次发布的全天成像图覆盖完整的七年观测时段。星际边界探测器（IBEX）自2008年起在轨运行，持续更新人类对太阳圈外层及其与本地星际介质相互作用的认知。任务起始时间为2008年12月25日。

目前已有14版IBEX ENA-Hi和/或ENA-Lo数据发布，覆盖2009—2017年的观测时段。本数据集包含以日心黄道经度（东、西向）与纬度角为坐标的全天成像图，对应两类高能中性原子氢通量：其一为IBEX ENA-Hi第2至第6能段（详见下表一）的通量；其二为IBEX ENA-Lo第5至第8能段（详见下表二）的通量。

第10版发布的数据细节与可开展的科学研究，可参考以下描述七年观测结果及IBEX-Hi、IBEX-Lo仪器的期刊文献：
McComas, D.J. 等人（2017），《利用IBEX对全球太阳圈进行七年成像》，《天体物理学杂志增刊系列》（Astrophys. J. Supp. Ser.），229(2)，41（共32页），https://doi.org/10.3847/1538-4365/aa66d8
Funnsten, H.O. 等人（2009），《星际边界探测器高能中性原子成像仪（IBEX-Hi）》，《空间科学评论》（Space Sci. Rev.），146，75-103，https://doi.org/10.1007/s11214-009-9504-y
Fuselier, S.A. 等人（2009），《IBEX-Lo传感器》，《空间科学评论》（Space Sci. Rev.），146，117-147，https://doi.org/10.1007/s11214-009-9495-8

IBEX ENA-Hi各能道/能段的中心能量与半高全宽（Full Width Half Maximum, FWHM）能量范围如下表所示：
| 能道编号 | 中心能量 | 能量范围 |
| ---- | ---- | ---- |
| 能道2 | ~0.71 keV | 0.52 keV 至 0.95 keV |
| 能道3 | ~1.11 keV | 0.84 keV 至 1.55 keV |
| 能道4 | ~1.74 keV | 1.36 keV 至 2.50 keV |
| 能道5 | ~2.73 keV | 1.99 keV 至 3.75 keV |
| 能道6 | ~4.29 keV | 3.13 keV 至 6.00 keV |

IBEX ENA-Lo各能道/能段的中心能量如下表所示：
| 能道编号 | 中心能量 |
| ---- | ---- |
| 能道1 | 0.015 keV |
| 能道2 | 0.029 keV |
| 能道3 | 0.055 keV |
| 能道4 | 0.110 keV |
| 能道5 | 0.209 keV |
| 能道6 | 0.439 keV |
| 能道7 | 0.872 keV |
| 能道8 | 1.821 keV |

本款特定的IBEX-Hi公共数据格式（Common Data Format, CDF）数据产品，源自命名格式为`hvset_noSP_ram_cg_yearN`（其中N取值1至7）的原始ASCII文件，包含迎风方向的像素成像图数据；已针对康普顿-格林效应进行修正（标注为cg），未对1 AU至100 AU区间内的ENA存活概率进行修正（标注为nosp），且成像图合成周期为七年。

综上，针对IBEX ENA-Hi与ENA-Lo，结合2种康普顿-格林修正设置、2种存活概率修正设置以及3种观测方向设置（背风antiram、迎风ram、全向omni），共生成12款第10版发布的IBEX ENA-Hi与ENA-Lo CDF数据产品。下表说明了各数据产品的文件命名格式构建规则。需注意：`ibex_h3_ena_hi_r10`为全部10款IBEX ENA-Hi CDF数据产品的命名根字段，而`ibex_h3_ena_lo_r10`为2款IBEX ENA-Lo CDF数据产品的命名根字段。下表最后一列的星号（*）标注了本款CDF数据产品在完整命名格式体系中对应的条目。

下表为各数据产品的命名规则详情：
| C-G修正 | 存活概率修正 | 观测方向 | 缩写 | ENA类型 | 七年全天图文件命名格式 |
| ---- | ---- | ---- | ---- | ---- | ---- |
| cg | nosp | 背风（antiram） | | ENA Hi | ibex_h3_ena_hi_r10_cg_nosp_antiram_7yr |
| cg | sp | 背风（antiram） | | ENA Hi | ibex_h3_ena_hi_r10_cg_sp_antiram_7yr |
| nocg | nosp | 背风（antiram） | | ENA Hi | ibex_h3_ena_hi_r10_nocg_nosp_antiram_7yr |
| nocg | sp | 背风（antiram） | | ENA Hi | ibex_h3_ena_hi_r10_nocg_sp_antiram_7yr |
| cg | nosp | 迎风（ram） | | ENA Hi | ibex_h3_ena_hi_r10_cg_nosp_ram_7yr * |
| cg | sp | 迎风（ram） | | ENA Hi | ibex_h3_ena_hi_r10_cg_sp_ram_7yr |
| cg | nosp | 全向（omni） | | ENA Hi | ibex_h3_ena_hi_r10_cg_nosp_omni_7yr |
| cg | sp | 全向（omni） | | ENA Hi | ibex_h3_ena_hi_r10_cg_sp_omni_7yr |
| nocg | nosp | 全向（omni） | | ENA Hi | ibex_h3_ena_hi_r10_nocg_nosp_omni_7yr |
| nocg | sp | 全向（omni） | | ENA Hi | ibex_h3_ena_hi_r10_nocg_sp_omni_7yr |
| nocg | nosp | 全向（omni） | | ENA Lo | ibex_h3_ena_lo_r10_nocg_nosp_omni_7yr |
| nocg | sp | 全向（omni） | | ENA Lo | ibex_h3_ena_lo_r10_nocg_sp_omni_7yr |

上表第一列表示是否已对数据施加康普顿-格林（C-G）修正。C-G修正用于修正IBEX航天器速度矢量相对于ENA入射方向的取向对ENA测量结果的影响：
* cg：已施加康普顿-格林修正
* nocg：未施加康普顿-格林修正

上表第二列表示是否已对数据施加存活概率（Survival Probability, SP）修正。SP修正用于修正ENA在穿越太阳圈过程中，因辐射压、光致电离以及与太阳风质子发生电荷交换电离而产生的损失，该修正将数据从IBEX所在的1 AU外推至约100 AU处。在原始数据中，该模式标注为Tabular。
* sp：已施加存活概率修正
* nosp：未施加存活概率修正

上表第三列表示各款IBEX ENA-Hi与ENA-Lo全天成像图构建时，对ENA入射方向与航天器运动相对关系施加的约束条件：
* omni：使用全部数据，未对IBEX速度矢量相对于入射ENA迎风方向施加约束
* ram：仅使用IBEX速度矢量指向入射ENA迎风方向时段的数据
* antiram：仅使用IBEX速度矢量背离入射ENA迎风方向时段的数据

IBEX第10版发布的数据被划分为6个月与1年两个时段分段。下表展示了第10版发布的1至14号成像图与任务第1至7年、轨道编号11至310b以及观测时段2008年12月25日至2015年12月23日的对应关系：

| 成像图编号 | 任务年份 | 轨道编号范围 | 观测时段 |
| ---- | ---- | ---- | ---- |
| 1 | 1 | 11-34 | 2008-12-25 至 2009-06-25 |
| 2 | 1 | 35-58 | 2009-06-25 至 2009-12-25 |
| 3 | 2 | 59-82 | 2009-12-25 至 2010-06-26 |
| 4 | 2 | 83-106 | 2010-06-26 至 2010-12-26 |
| 5 | 3 | 107-130a | 2010-12-26 至 2011-06-25 |
| 6 | 3 | 130b-150a | 2011-06-25 至 2011-12-24 |
| 7 | 4 | 150b-170a | 2011-12-24 至 2012-06-22 |
| 8 | 4 | 170b-190b | 2012-06-22 至 2012-12-26 |
| 9 | 5 | 191a-210b | 2012-12-26 至 2013-06-26 |
| 10 | 5 | 211a-230b | 2013-06-26 至 2013-12-26 |
| 11 | 6 | 231a-250b | 2013-12-26 至 2014-06-26 |
| 12 | 6 | 251a-270b | 2014-06-26 至 2014-12-24 |
| 13 | 7 | 271a-290b | 2014-12-24 至 2015-06-24 |
| 14 | 7 | 291a-310b | 2015-06-24 至 2015-12-23 |