The role of collisions with neutral hydrogen atoms in the formation of neutral iron lines in the quiet solar atmosphere: Fe I lines

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A redistribution of atoms on Fe I levels occurs due to collisions with neutral hydrogen. The sensitivity of central line depth to collisions with hydrogen is determined by the depth of formation of the line center and the excitation potential of the lower level; the moderate and strong lines which arise from metastable and semistable levels in the upper photosphere are most sensitive. The collisions with hydrogen have a weak influence on equivalent linewidths at the center of the solar disk; the influence is stronger for stronger photospheric lines closer to the limb. The equivalent widths and central depths of the chromospheric lines which arise from metastable and semistable levels have a faint response to collisions with hydrogen.

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