Comparative study of photo-produced ionosphere in the close environment of comets

Rosetta mission full comet phase results

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Table 1

Analytical formulas for the ion number density profiles for the inner coma present in the literature and provided here.

Analytical model/Assumptions	Comet size	PA	DR	Transport	Analytical	Applications
	(✓: r_c ≠ 0)				solution
	(✗: r_c = 0)				given in Eq.
Cravens (1987)	N/A	✗	✓	✗	(31)	1P – Giotto
Gombosi (2015)	✗	✗	✓	✓	(28)	Large r
Galand et al. (2016)	✓	✗	✗	✓	(29)	67P – Rosetta (>3 au)
This work:
Sect. 3.1	✗	✓	✓	✗	(19)	High activity
Sect. 3.2	✓	✓	✗	✓	(22)	⋯
Sect. 3.3	✓	✗	✓	✓	(27)	67P: Rosetta (∀d_h), r at Rosetta
Sect. 3.4	✓	✓	✓	✓	✗	1P: Giotto and 67P – Rosetta

Notes. For each model, we list the different assumptions, the corresponding equations in this paper, and the extent of their respective applications. r refers to thecometocentric distance, and N/A means “not applicable”.

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