Table 1: Eighteen first periods associated with stable (S) and unstable (U) eigenvalues (minutes) for A) left panel: B₀=10 G with A1) left column: weak helicity, A2) middle column: moderate helicity, A3) right column: strong helicity and B) right panel: B₀=100 G with B1, B2, B3 the same as in A. Higher order modes were not considered.
P_i Weak Moderate Strong Weak Moderate Strong

P₁ $1.921 \ S$ $0.209 \ S$ $0.525 \ i \ U$ $\ \ \$ $0.159 \ S$ $0.021 \ S$ $0.052 \ i \ U$

P₂ $1.869 \ S$ $0.204 \ S$ $0.450 \ S$ $\ \ \$ $0.158 \ S$ $0.020 \ S$ $0.044 \ S$

P₃ $1.535 \ S$ $0.169 \ S$ $0.430 \ S$ $\ \ \$ $0.154 \ S$ $0.017 \ S$ $0.042 \ S$

P₄ $1.533 \ S$ $0.168 \ S$ $0.424 \ i \ U$ $\ \ \$ $0.153 \ S$ $0.0167 \ S$ $0.042 \ i \ U$

P₅ $1.306 \ S$ $0.143 \ S$ $0.206 \ i \ U$ $\ \ \$ $0.151 \ S$ $0.014 \ S$ $0.020 \ i \ U$

P₆ $1.228 \ S$ $0.135 \ S$ $0.177 \ i \ U$ $\ \ \$ $0.15 \ S$ $0.013 \ S$ $0.017 \ i \ U$

P₇ $0.068 \ i \ S$ $0.070 \ i \ U$ $0.125 \ S$ $\ \ \$ $0.0047 \ i \ S$ $0.007 \ i \ U$ $0.0125 \ S$

P₈ $0.064 \ i \ S$ $0.066 \ i \ U$ $0.122 \ S$ $\ \ \$ $0.0046 \ i \ S$ $0.006 \ i \ U$ $0.012 \ S$

P₉ $0.042 \ i \ S$ $0.044 \ i \ U$ $0.101 \ S$ $\ \ \$ $0.0044 \ i \ S$ $0.0043 \ i \ U$ $0.0101 \ S$

P₁₀ $0.041 \ i \ S$ $0.043 \ i \ U$ $0.100 \ S$ $\ \ \$ $0.0043 \ i \ S$ $0.0042 \ i \ U$ $0.01 \ S$

P₁₁ $0.033 \ S$ $0.036 \ S$ $0.989 \ S$ $\ \ \$ $0.0042 \ i \ S$ $0.0036 \ S$ $0.099 \ S$

P₁₂ $0.032 \ S$ $0.035 \ S$ $0.096 \ S$ $\ \ \$ $0.0041 \ i \ S$ $0.0035 \ S$ $0.0096 \ S$

P₁₃ $0.030 \ i \ S$ $0.031 \ i \ U$ $0.085 \ S$ $\ \ \$ $0.003 \ S$ $0.0031 \ i \ U$ $0.0086 \ S$

P₁₄ $0.027 \ i \ S$ $0.029 \ i \ U$ $0.081 \ S$ $\ \ \$ $0.0026 \ S$ $0.003 \ i \ U$ $0.0081 \ S$

P₁₅ $0.025 \ S$ $0.027 \ S$ $0.077 \ S$ $\ \ \$ $0.0025 \ S$ $0.0027 \ S$ $0.0077 \ S$

P₁₆ $0.024 \ S$ $0.026 \ S$ $0.076 \ S$ $\ \ \$ $0.002 \ S$ $0.003 \ S$ $0.0076 \ S$

P₁₇ $0.02 \ S$ $0.02 \ S$ $0.063 \ S$ $\ \ \$ $0.0024 \ S$ $0.0021 \ S$ $0.0063 \ S$

P₁₈ $0.018 \ S$ $0.02 \ S$ $0.059 \ S$ $\ \ \$ $0.0024 \ S$ $0.0025 \ S$ $0.006 \ S$

**Table 1:** Eighteen first periods associated with stable (S) and unstable (U) eigenvalues (minutes) for A) left panel: B₀=10 G with A1) left column: weak helicity, A2) middle column: moderate helicity, A3) right column: strong helicity and B) right panel: B₀=100 G with B1, B2, B3 the same as in A. Higher order modes were not considered.
P_i	Weak	Moderate	Strong		Weak	Moderate	Strong
P₁	$1.921 \ S$	$0.209 \ S$	$0.525 \ i \ U$	$\ \ \$	$0.159 \ S$	$0.021 \ S$	$0.052 \ i \ U$
P₂	$1.869 \ S$	$0.204 \ S$	$0.450 \ S$	$\ \ \$	$0.158 \ S$	$0.020 \ S$	$0.044 \ S$
P₃	$1.535 \ S$	$0.169 \ S$	$0.430 \ S$	$\ \ \$	$0.154 \ S$	$0.017 \ S$	$0.042 \ S$
P₄	$1.533 \ S$	$0.168 \ S$	$0.424 \ i \ U$	$\ \ \$	$0.153 \ S$	$0.0167 \ S$	$0.042 \ i \ U$
P₅	$1.306 \ S$	$0.143 \ S$	$0.206 \ i \ U$	$\ \ \$	$0.151 \ S$	$0.014 \ S$	$0.020 \ i \ U$
P₆	$1.228 \ S$	$0.135 \ S$	$0.177 \ i \ U$	$\ \ \$	$0.15 \ S$	$0.013 \ S$	$0.017 \ i \ U$
P₇	$0.068 \ i \ S$	$0.070 \ i \ U$	$0.125 \ S$	$\ \ \$	$0.0047 \ i \ S$	$0.007 \ i \ U$	$0.0125 \ S$
P₈	$0.064 \ i \ S$	$0.066 \ i \ U$	$0.122 \ S$	$\ \ \$	$0.0046 \ i \ S$	$0.006 \ i \ U$	$0.012 \ S$
P₉	$0.042 \ i \ S$	$0.044 \ i \ U$	$0.101 \ S$	$\ \ \$	$0.0044 \ i \ S$	$0.0043 \ i \ U$	$0.0101 \ S$
P₁₀	$0.041 \ i \ S$	$0.043 \ i \ U$	$0.100 \ S$	$\ \ \$	$0.0043 \ i \ S$	$0.0042 \ i \ U$	$0.01 \ S$
P₁₁	$0.033 \ S$	$0.036 \ S$	$0.989 \ S$	$\ \ \$	$0.0042 \ i \ S$	$0.0036 \ S$	$0.099 \ S$
P₁₂	$0.032 \ S$	$0.035 \ S$	$0.096 \ S$	$\ \ \$	$0.0041 \ i \ S$	$0.0035 \ S$	$0.0096 \ S$
P₁₃	$0.030 \ i \ S$	$0.031 \ i \ U$	$0.085 \ S$	$\ \ \$	$0.003 \ S$	$0.0031 \ i \ U$	$0.0086 \ S$
P₁₄	$0.027 \ i \ S$	$0.029 \ i \ U$	$0.081 \ S$	$\ \ \$	$0.0026 \ S$	$0.003 \ i \ U$	$0.0081 \ S$
P₁₅	$0.025 \ S$	$0.027 \ S$	$0.077 \ S$	$\ \ \$	$0.0025 \ S$	$0.0027 \ S$	$0.0077 \ S$
P₁₆	$0.024 \ S$	$0.026 \ S$	$0.076 \ S$	$\ \ \$	$0.002 \ S$	$0.003 \ S$	$0.0076 \ S$
P₁₇	$0.02 \ S$	$0.02 \ S$	$0.063 \ S$	$\ \ \$	$0.0024 \ S$	$0.0021 \ S$	$0.0063 \ S$
P₁₈	$0.018 \ S$	$0.02 \ S$	$0.059 \ S$	$\ \ \$	$0.0024 \ S$	$0.0025 \ S$	$0.006 \ S$

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