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Brian Jackson edited section_Formulating_the_Recovery_Biases__.tex
over 8 years ago
Commit id: 84fc4943b626181bf7d41361bbe2cfbcea1ce2c8
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\begin{enumerate}
\item Each dust devil pressure profile has one well-defined center, and the pressure
dip (relative to the ambient pressure) observed profile at a radial distance $r$ from the center
of the dust devil follows a
Lorentz profile: Lorentzian: $P(r) = \dfrac{P_{\rm act}}{1 + \left( 2r/\Gamma_{\rm act} \right)^2 }$. Here $P_{\rm act}$ represents the actual pressure depth at the devil's center, and $\Gamma_{\rm act}$ the profile full-width at half-max.
However, alternative Alternative profiles have been
suggested. \cite{Lorenz_2014} suggested either a suggested, including Burgers-Rott or Vastitas
profile profiles that might provide more accurate physical description of a dust devil
profile. Using a profile \citep{Lorenz2014}. A different profile would likely
change the modify our results here but not substantially.
Given that the Lorentz profile is more commonly used in the field, we opt to use it here. The profile is also assumed not to change with time.
\item A dust devil is carried past the sensor with the ambient wind field at a velocity $\upsilon$. For simplicity, we will assume the wind velocity vector is constant in magnitude and direction, while in reality, the ambient wind field carrying a devil can be complex, even causing multiple encounters between devil and sensor and consequently more complex pressure signals \citep{Lorenz_2013}. The upshot of this assumption is that a devil whose center passes directly over the sensor will register a pressure dip with a full-width at half-max in time $\Gamma^\prime_{\rm act} = \Gamma_{\rm act}/\upsilon$. The profile width in time that is actually observed is $\Gamma^\prime_{\rm obs}$.