Cometary emissions induced by scattering and fluorescence of solar X-rays

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Table 1

Model parameters based on Chandra cometary observations and solar spectra data.

Parameter	8P	Encke	IZ	LS4	MH

Obs. date^a	2008 Jan. 01−04	2003 Nov. 24	2002 April 15−16	2000 July 14	2001 Jan. 8−15
T_exp (ks)^a	47	44	24	9.4	16.9
r_c (AU)^a	1.10	0.89	0.81	0.80	1.26
\| r_c − R₀ \| (AU)^a	0.25	0.28	0.45	0.53	1.37
Q_H₂O (10²⁸ mol s^-1)	2.2^b	0.7^c	20^d	3^e	12^d
ℐ_GOES (10⁵ photons cm^-2 s^-1)	0.62	4.4	30	31	6.2

Notes. Column 1 lists the following parameters: Chandra observation date, observation exposure time T_exp in ks, comet-Sun distance r_c in AU, comet-Earth distance | r_c − R₀ | in AU, H₂O production rate Q_H₂O in molecules s^-1, and average observed intensity from GOES over the 1.5−15.0 keV range during observation ℐ_GOES in photons cm^-2 s^-1.

Reference.

^(a)

Ewing et al. (2013);

^(b)

Christian et al. (2010);

^(c)

Lisse et al. (2005);

^(d)

Biver et al. (2006);

^(e)

Lisse et al. (2001).

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