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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: The first simultaneous spectroscopic and monochromatic imaging observations of short-wavelength infrared aurora of \(\mathrm {N_{2}^{+}}\) Meinel (0,0) band at 1.1 \(\mathrm {\mu }\)m with incoherent scatter radar

Fig. 4

a Scatter plots for \(\mathrm {N_{2}^{+}}\) (M) intensity observed by the NIRAS-2 and electron density for different altitudes. b Correlation coefficients between the \(\mathrm {N_{2}^{+}}\) (M) intensity and the squared electron density as a function of altitudes. c A scatter plot for 110 km altitude in the same format as a. A red line is a fitted curve for the assumption that \(\mathrm {N_{2}^{+}}\) (M) intensity is proportional to the squared electron density

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