BARREL 2C Data Processing Unit (HKPG) Analog Housekeeping Voltage, Temperature, Current, and Payload Status, Level 2, 40 s Data

Housekeeping voltage, temperature, current, and payload status values returned every 40 s. NOTE: The analog sensor data in these records are based on the nominal BARREL housekeeping layout. Some payloads may have small differences that are not reflected here. If there is specific sensor data that you need that looks questionable, please contact the BARREL team for clarification.

The BARREL Mission was a multiple-balloon investigation designed to study electron losses from Earth's Radiation Belts. Selected as a NASA Living with a Star Mission of Opportunity, BARREL was designed to augment the Radiation Belt Storm Probes, RBSP, mission by providing measurements of the spatial and temporal variations of electron precipitation from the radiation belts. The RBSP mission has since been renamed the Van Allen Probes mission. Each BARREL balloon carried an X-ray spectrometer to measure the bremsstrahlung X-rays produced by precipitating relativistic electrons as they collide with neutrals in the atmosphere, and a DC magnetometer to measure ULF-timescale variations of the magnetic field. BARREL observations collected near latitudes close to either the antarctic and arctic circles at stratospheric altitudes at about 30 km. The BARREL instrumentation provided the first balloon measurements of relativistic electron precipitation while comprehensive in situ measurements of both plasma waves and energetic particles were available. Also, the BARREL data has been used to characterize the spatial scale of precipitation at relativistic energies.

The initial pair of balloon campaigns that were conducted initially during the Austral summer months of January and February of 2013 and 2014 with launches from two stations located in Antarctica: the British base located at Halley Bay on the Brunt Ice Shelf and the South African SANAE IV base (SANAE stand for South African National Antarctic Expedition) located in Vesleskarvet, Queen Maud Land. For the 2013 and 2014 the balloon campaigns, the launch plan was designed to maintain an array with about five payloads spread across about six hours of magnetic local time, MLT, in the region that magnetically maps to the radiation belts. Thus, the BARREL balloon constellation constituted an evolving and slowly moving array able to study relativistic electron precipitation from the radiation belts.

Later campaigns were undertaken in 2015 and 2016 from the Esrange Space Center located in Kiruna, Sweden. The 2015 and 2016 campaigns were undertaken in coordination with the Van Allen Probes mission, the European Incoherent Scatter Scientific Association, EISCAT, incoherent scatter radar system, and other ground and space based instruments. Seven balloon launches occurred during the August 2015 BARREL campaign. A total of eight flights occurred during August 2016.

Summing over the four BARREL campaigns, over 50 small, approximately 20 kg, stratospheric balloons were successively launched. The website creeated and hosted by A.J. Halford (see Information URL below) reports that: "By the end of the campaigns, there were over 90 researchers coordinating on a daily basis with the BARREL team working on 7 different satellite missions, 1 other balloon mission, and way too many ground based instruments to count." Although the BARREL mission launched only balloons during the years from 2013 to 2016, research using data collected on these flights is ongoing, so stay tuned for updates! All data and analysis software are freely available to the scientific community.

The information listed above in this resource description was compiled by referencing several BARREL related resources including primarily the Millan et al. (2013) Space Science Reviews publication, the BARREL at Dartmouth mission web site, and the website maintained by A.J. Halford.

The current release of all BARREL CDF data products are Version 10 files.

BARREL will make all its scientific data products quickly and publicly available but all users are expected to read and follow the BARREL Data Usage Policy listed below.

BARREL Data Usage Policy

BARREL data products are made freely available to the public and every effort is made to ensure that these products are of the highest quality. However, there may occasionally be issues with either the instruments or data processing that affect the accuracy of data. When possible, a quality flag is included in higher level data products, and known issues are posted in the BARREL data repository. You are also strongly encouraged to follow the guidelines below if you are planning a publication or presentation in which BARREL data are used. This will help you ensure that your science results are valid.

* Users should always use the highest version numbers of data and analysis tools. Browse/quick-look plots are not intended for science analysis or publication and should not be used for those purposes without consent of the principal investigator, PI.
* Users should notify the BARREL PI of the data use and investigation objectives. This will ensure that you are using the data appropriately and have the most recent version of the data or analysis routines. Additionally, if a BARREL team member is already working on a similar or related topic, they may be able to contribute intellectually.
* If BARREL team members are not part of the author list, then users should Credit/Acknowledge the BARREL team as follows: We acknowledge the BARREL team (PI: Robyn Millan) for use of BARREL data.
* Users are also requested to provide the PI with a copy of each manuscript that uses BARREL data upon submission of that manuscript for consideration of publication. On publication, the citation should be transmitted to the PI.

The BARREL PI can be contacted at: [e-mail].

An online copy of the BARREL Data Usage Policy document can be found at: https://barrel.rmillan.host.dartmouth.edu/documents/data.use.policy.pdf.

每40秒传回一次内务电压（housekeeping voltage）、温度、电流以及载荷状态数据。注意：本记录中的模拟传感器数据基于标准BARREL内务配置方案。部分载荷可能存在未在此体现的细微差异。若您所需的特定传感器数据存疑，请联系BARREL项目团队进行确认。

BARREL项目是一项多气球探测任务，旨在研究地球辐射带（Earth's Radiation Belts）中的电子损失现象。该项目被选为NASA“恒星相伴”机遇任务（NASA Living with a Star Mission of Opportunity），通过测量辐射带内电子沉降的时空变化，为辐射带风暴探测器（Radiation Belt Storm Probes，RBSP）任务提供补充观测。此后，RBSP任务更名为范艾伦探测器任务（Van Allen Probes mission）。每枚BARREL气球均搭载X射线光谱仪（X-ray spectrometer），用于测量相对论性电子（relativistic electrons）与大气中性粒子碰撞时产生的韧致辐射X射线（bremsstrahlung X-rays）；同时搭载直流磁力计（DC magnetometer），用于测量超低频时标（ULF-timescale）的磁场变化。BARREL的观测站位位于接近南极圈与北极圈的纬度附近，飞行高度约30千米的平流层中。BARREL的探测设备首次实现了相对论性电子沉降的气球原位测量，彼时可同时获取等离子体波（plasma waves）与高能粒子（energetic particles）的综合原位观测数据。此外，BARREL数据还被用于表征相对论性能量下电子沉降的空间尺度。

首批两次气球探测作业于2013年与2014年的南夏季（1月至2月）开展，发射地点位于南极洲的两处站点：布伦特冰架（Brunt Ice Shelf）哈利湾的英国科考站，以及毛德皇后地（Queen Maud Land）维斯莱斯卡韦特的南非SANAE IV站（SANAE为南非国家南极考察队South African National Antarctic Expedition的缩写）。在2013与2014年的气球探测作业中，发射方案旨在维持一组由约5个载荷组成的阵列，该阵列在磁映射至辐射带的区域内，覆盖约6小时的磁地方时（magnetic local time，MLT）范围。由此，BARREL气球星座构成了一个动态缓慢移动的观测阵列，可用于研究辐射带内的相对论性电子沉降现象。

后续的探测作业于2015年与2016年在瑞典基律纳的埃斯兰厄航天中心（Esrange Space Center）开展。2015与2016年的作业与范艾伦探测器任务、欧洲非相干散射科学协会（European Incoherent Scatter Scientific Association，EISCAT）的非相干散射雷达系统，以及其他地面与空间探测仪器协同进行。2015年8月的BARREL作业期间共完成7次气球发射，2016年8月则共计完成8次飞行任务。

综上，四次BARREL探测作业累计成功发射了超过50枚重量约20千克的平流层小型气球。由A.J.哈尔福德创建并维护的网站（详见下文信息链接）显示：“截至作业结束时，已有超过90名研究人员每日与BARREL团队协同工作，参与7项不同的卫星任务、1项其他气球探测任务，以及数量难以统计的地面探测仪器的相关研究。”尽管BARREL任务在2013至2016年仅开展气球发射作业，但基于这些飞行任务获取的数据的相关研究仍在持续，敬请关注后续更新！所有数据与分析软件均向科学界免费开放。

本资源描述中所列的信息，参考了多项与BARREL相关的资料汇编而成，主要包括Millan等人2013年发表于《Space Science Reviews》的论文、达特茅斯学院BARREL任务官网，以及A.J.哈尔福德维护的网站。

当前发布的所有BARREL通用数据格式（CDF，Common Data Format）数据产品均为V10版本文件。

BARREL将尽快向公众公开所有科学数据产品，但所有用户均需阅读并遵守下文所列的BARREL数据使用政策。

BARREL数据使用政策
BARREL数据产品向公众免费开放，团队将尽最大努力确保数据产品的最高质量。但仪器或数据处理过程中偶尔可能出现影响数据准确性的问题。在可行的情况下，高阶数据产品中会包含质量标记，已知问题也会发布于BARREL数据仓库中。若您计划在发表论文或进行学术汇报时使用BARREL数据，强烈建议遵循以下指南，以确保您的科研结果严谨可靠：
· 始终使用数据与分析工具的最新版本。快速浏览绘图（Browse/quick-look plots）并非用于科学分析或论文发表，未经项目首席研究员（Principal Investigator，PI）许可，不得将其用于此类用途。
· 需向BARREL项目首席研究员告知数据使用用途与研究目标。此举可确保您正确使用数据，并获取最新版本的数据或分析程序。此外，若BARREL团队成员已开展类似或相关主题的研究，您可向其寻求学术协作。
· 若BARREL团队成员未被列入作者名单，需按如下方式致谢BARREL团队：“本研究使用了BARREL项目的数据，特此感谢BARREL团队（首席研究员：Robyn Millan）。”
· 请在提交使用BARREL数据的论文供评审时，向首席研究员提供论文副本。论文正式发表后，请将引用信息告知首席研究员。

可通过以下邮箱联系BARREL项目首席研究员：[e-mail]。

BARREL数据使用政策文档的在线副本可通过以下链接获取：https://barrel.rmillan.host.dartmouth.edu/documents/data.use.policy.pdf。