Much data can be obtained by measuring the dispersion of cosmic radio waves passing near the sun . 测定穿过太阳附近的宇宙射电波的色散度也可以获得许多资料。
2.
the spectrograph uses a concave diffraction grating that provides a wavelength dispersion of 4. 2a°/mm in the first order. 光谱仪用了一块凹面衍射光栅,第一级光谱的色散度为42埃毫米。