At this height the satellote is able to scan a swath

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altitude of 650 km with a inclination of 74 degrees[4]. At this height, the satellote is able to scan a swath that is 110.8 degrees in width, corresponding to a surface distance of roughly 3000 km[3]. This is
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a relatively small area of earth surface, so the satellite does not always orbit at the same lattitude. It moves from 60 degrees south to 60 degrees north so that it can have the best global coverage. So the occultation lattitude as a function of date for the satellite is similar to a sinusoid (see figure 2). Essencially, the satellite's orbit repeats itself every year. The main purpose of the ACE mission is to collect datas of the spectra of sunlight at infrared and ultraviolet wavelength. Sunlight is a kind of electromagnetic wave, it consists different waves with different wavelengths. Wavelength of 0~400 nm is ultraviolet, 400~750 nm is visible, and 750~3000nm is infrared. In order to collect datas of these radiations precisely, the satellite uses two high-tech instruments: FTS and MAESTRO. When FTS (Fourier Transorm Spectrometer) detects sunlight, the interferometer inside it reflects and refracts sunlight several times in order to create optical path difference and an “end” mirror inside the interderometer multiples the difference into a detectable scale[5]. Technically, when sunlight passes the mirrors, there is a difference of travel time of ultraviolet and infrared, thus creates a variable delay and optical path difference. Thus, ultraviolet and infrared radiation split and get detected by different detector and get measured. Another important instrument is the MAESTRO. MAESTRO has two spectrographs in it, which reduces the stray light and permits simultaneous measurements of the two bands with spectral resolution of 1-2 nm, depending on wavelength[6]. With the help of FTS and MAESTRO , the satellite is able to make precise measurements of sunlight . And these datas are widely used to calculate and predict the ozone depletion.
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