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Coefficient a partial transient temperature rise

This is the coefficent $a_0$ used for calculating cable partial transient temperature rise acc. to IEC 60853-2.

Symbol
$a_{0}$
Unit
1/s
Formulas
$\frac{M_{0}+\sqrt{{M_{0}}^2-N_{0}}}{N_{0}}$
Related
$M_{0}$
Coefficient M partial transient temperature rise [s]
$N_{0}$
Coefficient N partial transient temperature rise [s$^2$]
Used in
$\alpha_{t}$
Conductor to surface attainment factor
$\delta \theta_{c,t,o}$
Transient temperature rise conductor by ohmic losses [K]
$T_{a0}$
Apparent thermal resistance a [K.m/W]