照片显示的圣·海伦斯山热象的白色部分表示热区。这种热象是用探测测距装置(DRS)得到的,该装置是休斯飞机公司为海军A-6E“入侵者”飞机研制的集成夜间攻击系统。在圣·海伦斯山上方使用这种装置能使地质学家监视出现重大热活动的区域。 The photo shows the hot white part of the St Helens mountains representing the hot zone. This thermal image was obtained using a probing distance measuring device (DRS), an integrated night attack system developed by Hughes Aircraft for the Navy’s A-6E Intruder. The use of such a device above St. Helens enables geologists to monitor areas where significant thermal activity occurs.