Using the Sun to estimate Earth-like planets detection capabilities - V. Parameterizing the impact of solar activity components on radial velocities

Home

All issues

Volume 581 (September 2015)

A&A, 581 (2015) A133

Full HTML

Free Access

Table 1

Input parameters.

	Parameter	Value	Unit	Reference

Solar activity	Reference cycle	Solar cycle 23
	cycle length	12.5	[year]
	Time step	1	[day]
	Time step random dispersion	4	[hour]
	Wolf number normalization	n₀ = 1.32
		n₁ = 0.148
	Wolf number random dispersion	d₀ = 6.922
		d₁ = 0.7594
		d₂ = −0.00348

Spatio-temporal	Mean start latitude	± 22	[°]
distribution	Mean end latitude	± 9	[°]
	Standard lat. dispersion	6	[°]
	Max. lat. dispersion	20	[°]
	North/south asymmetry	0.5	−
	Active longitude spot fraction	0.4	−
	Active longitude extension area	± 20	[°]

Large scale dynamics	Spot differential rotation	ω₀ = 14.523	[°/day]	Ward (1966)
		ω₁ = −2.688	[°/day]	This paper
		ω₂ = 0	[°/day]	This paper
	Facula and network	ω_b0 = 14.562	[°/day]	Meunier (2005)
	differential rotation	ω_b1 = −2.04	[°/day]	This paper
		ω_b2 = −1.49	[°/day]	This paper
	Meridional flow, all structures	α = 12.9	[m s^-1]	Komm et al. (1993)
		β = 1.4	[m s^-1]	This paper
	Stellar radius	1 R_⊙ = 696 400	[km]

Spots properties
	Isolated spots

	Total fraction	0.4	−	Martinez Pillet et al. (1993)
	Mean initial size	46.51^a	[μHem]	Baumann & Solanki (2005)^b
	Standard size deviation	2.14	[μHem]	This paper
	Max. size	1500	[μHem]	Papers I and II
	Mean decay	−18.9	[μHem/day]	Martinez Pillet et al. (1993)^c
	Median decay	−14.8	[μHem/day]	This paper

	Complex spot groups

	Total fraction	0.6	−	Martinez Pillet et al. (1993)
	Mean initial size	90.24^a	[μHem]	Baumann & Solanki (2005)^d
	Standard size deviation	2.49	[μHem]	This paper
	Max. size	5000	[μHem]	Papers I and II
	Mean decay	−41.3	[μHem/day]	Martinez Pillet et al. (1993)^e
	Median decay	−30.9	[μHem/day]	This paper

	Both spot types

	Min. decay value	−3	[μHem/day]
	Max. decay value	−200	[μHem/day]
	Min. spot size	10	[μHem]	Papers I and II

Faculae properties	q (facula-to-spot ratio)
	Mean log(q)	0.8	−
	Standard deviation (log(q))	0.4	−
	Min.- Max. log(q)	0.1–5	−
	Mean decay	−27	[μHem/day]
	Median decay	−20	[μHem/day]
	Min. facula size	3	[μHem]	Papers I and II

Network properties	Diffusion coefficient	300	[km² s^-1]	Schrijver (2001)
	Remainder fraction for decay	0.975	[ /day]
	Min. size	3	[μHem]	Papers I and II
	Facula fraction recovered in network	0.8	−

Notes. Free parameters are given in italics.

^(a)

For these two parameters, the value taken from Baumann & Solanki (2005) was multiplied by a factor 1.54 to better fit the spot catalogs used in Papers I and II.

^(b)

See the Table 1 of the paper, total area of single spots, snapshot method.

^(c)

Table 3, standard cycle.

^(d)

Table 1, total area, snapshot method.

^(e)

Table 1, standard cycle.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.