Uranus’ hydrogen upper atmosphere: Insights from pre- and post-equinox HST Lyman-α images

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Table 2

Atomic hydrogen in our reference atmosphere models for Uranus’ 1998 and 2011 HST observations.

	Ambient H	H^*				$H_{esc}^{}$ ${\rm{H}}_{{\rm{esc}}}^$
	Major contribution to	Major contribution to				Major contribution to
	radial brightness from:	radial brightness from:				radial brightness from:
	0 to ~1 R_U	~1 to 2.5 R_U (1998)				≳2.5 R_U (1998)
		~ 1 to 2.5 R_U (2011)				≳2.5 R_U (2011)

Year	Abundance	T	𝓏_max	H	Abundance (N)	T	Abundance
Year	(cm⁻²)	(eV)	(km)	(km)	(cm⁻²)	(eV)	(cm⁻²)
1998	4.2 × 10¹⁷	0.3	3000	5000	2.1 × 10¹⁴	2	0.4 × 10¹³
2011	2.8 × 10¹⁷	0.3	3000	5000	1.4 × 10¹³	2	0.4 × 10¹³

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