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Title: Wave versus nanoflare heating fraction in active-region coronal loops
Plain: Heating could come as countless tiny explosions (nanoflares) or as a steady trickle from waves; each leaves a different temperature fingerprint.
Precise: For active-region loops at $T \sim 1e6\ \text{to}\ 5e6\,\mathrm{K}$, determine the fraction of heating delivered impulsively (nanoflares with repeat times longer than the cooling time, producing faint plasma at $5e6\ \text{to}\ 1e7\,\mathrm{K}$) versus steadily. Observables: slope of the emission measure distribution $\mathrm{EM}(T) \sim T^a$ below the peak and the hot emission measure above $5e6\,\mathrm{K}$. Answer: the impulsive fraction with uncertainty.
Settled by: Spectroscopic measurement of faint $5e6\ \text{to}\ 1e7\,\mathrm{K}$ emission in active regions compared with forward models of both heating types.
Kind: well-posed
Answer type: value
References: (empty)
Literature status: open
Status note: (empty)
Posed since: (empty)