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Differential rotation is the basis of the solar dynamo theory. Synoptic mapsof He I intensity from Carrington rotations 2032 to 2135 are utilized toinvestigate the differential rotation of the solar chromosphere in the He Iabsorption line. The chromosphere is surprisingly found to rotate faster thanthe photosphere below it. The anomalous heating of the chromosphere and coronahas been a big problem in modern astronomy. It is speculated that thesmall-scale magnetic elements with magnetic flux in the range of $(2.9 -32.0)\times 10^{18}$ Mx which are anchored in the leptocline, heat the quietchromosphere to present the anomalous temperature increase, causing it torotate at the same rate as the leptocline. The differential of rotation rate inthe chromosphere is found to be strengthened by strong magnetic fields, but instark contrast, at the photosphere strong magnetic fields repress thedifferential of rotation rate. A plausible explanation is given for thesefindings.

Differential rotation of the chromosphere in the He I absorption line