IBEX-Lo

The IBEX-Lo instrument measures ENA's in eight energy
bands within the 0.01-2.0 keV range. The instrument is a single-pixel
imager with a 7x7 deg field of view (FOV) in three 90 deg quadrants and
a 3.5 x 3.5 deg FOV in a fourth, "high resolution" quadrant.
The eight energy windows overlap and have center energies of 14, 27, 52,
102, 197, 451, 908 and 1903 eV. These are referred to as bands 1 to 8,
respectively, in data products. The instrumentation includes a triple-
coincidence time-of-flight mass spectrometer to help distinguish between
heliospheric hydrogen and interstellar oxygen and helium. The instrument
images full 360 deg swaths of the sky each 15-sec spacecraft spin about
the sun-pointing spin axis. In normal operation, two successive spins
are devoted to each energy window every 16 spin (~4 min) periods.

IBEX-Lo仪器在0.01-2.0 keV能谱范围内，对能量进行了八个能带的测量。该仪器为一单像素成像设备，具有7x7度的视场（FOV），分为三个90度的象限以及一个3.5x3.5度的“高分辨率”象限。八个能量窗口相互重叠，中心能量分别为14、27、52、102、197、451、908和1903 eV，在数据产品中分别对应1至8号能带。仪器配备有三级符合飞行时间质谱仪，以帮助区分日球层氢与星际氧和氦。仪器沿全360度天空路径进行成像，每15秒绕指向太阳的旋转轴旋转一次。在正常操作中，每16次旋转周期（约4分钟）中，连续两次旋转用于每个能量窗口的测量。