论文标题
精灵任务
The ELFIN Mission
论文作者
论文摘要
电子损失和田野调查使用时空的歧义解析选项（Elfin-Star，或简单：Elfin）任务包括两个相同的3个单位（3U）立方体（在极地（〜93deg倾斜度）上，几乎是圆形，低年度（〜450 km Altitude）轨道。 Elfin于2018年9月15日启动，预计将拥有> 2。5年的寿命。它的主要科学目标是解决风暴时间相对论电子降水的机制，该机制是电磁离子回旋（EMIC）波是主要候选者。 Elfin从其电离层的Vantage点开始，使用其独特的俯仰角度分辨能力来确定损耗锥体内测得的相对论电子螺距角和能量光谱是否具有emic波散射的特征性特征，还是由于其他过程是否可能是由于其他过程所致。将相同的Elfin卫星与缓慢变化的沿轨道分离配对，可以在几分钟到十分钟的时间尺度上抑制降水的空间和时间演化，这比单个低空卫星的轨道周期快（〜90min）。每个卫星都带有电子（EPDE）的能量颗粒探测器，该检测器在〜72厘米的繁荣上测量了50keV至5mev电子，并在〜72厘米的繁荣上测量了磁场波（例如，emic波）（例如，从dc/dc/sq nyequist）（emic波（例如，ny）<0. 3. nyequist <0。 1Hz。旋转卫星（T_SPIN〜3S）配备了允许旋转/向下和重新定向操作的磁音。旋转轴将正常放置在轨道平面上，使每个旋转两次螺距角度分辨率。离子（EPDI）的能量粒子检测器测量250KeV-5Mev离子，以解决二级科学。 Elfin最初由Calspace和University Nanosat计划资助，在2014年至2018年间，在NSF和NASA的联合支持下被选为飞行。
The Electron Loss and Fields Investigation with a Spatio-Temporal Ambiguity-Resolving option (ELFIN-STAR, or simply: ELFIN) mission comprises two identical 3-Unit (3U) CubeSats on a polar (~93deg inclination), nearly circular, low-Earth (~450 km altitude) orbit. Launched on September 15, 2018, ELFIN is expected to have a >2.5 year lifetime. Its primary science objective is to resolve the mechanism of storm-time relativistic electron precipitation, for which electromagnetic ion cyclotron (EMIC) waves are a prime candidate. From its ionospheric vantage point, ELFIN uses its unique pitch-angle-resolving capability to determine whether measured relativistic electron pitch-angle and energy spectra within the loss cone bear the characteristic signatures of scattering by EMIC waves or whether such scattering may be due to other processes. Pairing identical ELFIN satellites with slowly-variable along-track separation allows disambiguation of spatial and temporal evolution of the precipitation over minutes-to-tens-of-minutes timescales, faster than the orbit period of a single low-altitude satellite (~90min). Each satellite carries an energetic particle detector for electrons (EPDE) that measures 50keV to 5MeV electrons with deltaE/E<40% and a fluxgate magnetometer (FGM) on a ~72cm boom that measures magnetic field waves (e.g., EMIC waves) in the range from DC to 5Hz Nyquist (nominally) with <0.3nT/sqrt(Hz) noise at 1Hz. The spinning satellites (T_spin~3s) are equipped with magnetorquers that permit spin-up/down and reorientation maneuvers. The spin axis is placed normal to the orbit plane, allowing full pitch-angle resolution twice per spin. An energetic particle detector for ions (EPDI) measures 250keV-5MeV ions, addressing secondary science. Funded initially by CalSpace and the University Nanosat Program, ELFIN was selected for flight with joint support from NSF and NASA between 2014 and 2018.
