Ionic emission from and activity evolution in comet C/2020 F3 (NEOWISE): Insights from long-slit spectroscopy and photometry

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Table 5

Observed ion abundance ratios.

Distance [km]	$N_{2}^{+} {/CO}^{+} (3 - 0)$ ${\rm{N}}_{\rm{2}}^{\rm{ + }}{\rm{/C}}{{\rm{O}}^ + }\left( {3{\rm{ - }}0} \right)$	$N_{2}^{+} {/CO}^{+} (2 - 0)$ ${\rm{N}}_{\rm{2}}^{\rm{ + }}{\rm{/C}}{{\rm{O}}^ + }\left( {2{\rm{ - }}0} \right)$	$N_{2}^{+} {/H}_{2} O^{+} (0 - 8 -0)$ ${\rm{N}}_{\rm{2}}^{\rm{ + }}{\rm{/}}{{\rm{H}}_2}{{\rm{O}}^ + }\left( {0{\rm{ - }}8{\rm{ - 0}}} \right)$
35 809	0.026 ± 0.005	0.031 ± 0.006	0.045 ± 0.006
53 783	0.029 ± 0.003	0.028 ± 0.004	0.063 ± 0.008
71 688	0.035 ± 0.008	0.035 ± 0.008	0.098 ± 0.017
89 294	0.035 ± 0.007	0.032 ± 0.009	0.142 ± 0.033
103 548	0.031 ± 0.006	0.029 ± 0.007	0.154 ± 0.053

Notes. The reported abundance are for an aperture of 12″ at increasing distances from the photocentre.

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