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Brian Jackson edited Figure_ref_fig_n_Pobs_from_uniform_n__.tex
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Figure \ref{fig:n-Pobs_from_uniform_n-Pact} shows how significantly \subsection{Converting Between the
miss distance effect modifies Observed and Underlying Distributions}
We can use the
observed distribution of pressure depths as compared encounter geometry to
model the
underlying distribution. Well away from the $P_{\rm max}$, the distribution $n(P_{\rm obs})$ follows a statistical probability for $P_{\rm
obs}^{-2}$ power-law, similar obs}$ and $\Gamma_{\rm obs}$ to
what has been observed in several studies. However, the lack fall within a certain range of
devils with $P_{\rm act} > P_{\rm max}$ means that eventually the values, given a distribution
declines toward zero. of $P_{\rm act}$- and $\Gamma_{\rm act}$-values. The probability density for passing between $b$ and $b + db$ of a devil is $dp(b) = 2 b\ db / b_{\rm max}^2 $ for $b \le b_{\rm max}$.
As Consider a
check distribution of
this result, we also conducted a Monte-Carlo simulation observed values $\rho(P_{\rm obs}, \Gamma_{\rm obs}) = \dfrac{d^2N}{dP_{\rm obs}\ d\Gamma_{\rm obs}}$. The small number of
dust devil encounters, similar to that in \citet{Lorenz_2014}. We modeled 100,000 dust devils
with a uniform distribution of $P_{\rm $dN = f\ \rho(P_{\rm act}, \Gamma_{\rm act})\ dP_{\rm act}\ d\Gamma_{\rm act}$
contributing are those that had closest approach distances between
$P_{\rm min}$ $b$ and
$P_{\rm $b + db$ of the detector. Thus, we can convert $f\ \rho(P_{\rm act}, \Gamma_{\rm act})$ to $\rho(P_{\rm obs}, \Gamma_{\rm obs})$ by integrating from $b = 0$ to $b_{\rm max}$ and
assumed a fixed value setting $\Gamma_{\rm act}(b) = \sqrt{\Gamma_{\rm obs} - \left( 2b \right)^2}$ and $P_{\rm act}(b) = P_{\rm obs}\left[ 1 + \left( \dfrac{2b}{\Gamma_{\rm act}} \right)^2 \right]$. To perform the integral, we need to re-cast the upper limit $b_{\rm max}$ in terms of the observed parameters, $b_{\rm max} = \sqrt{\Gamma_{\rm obs}^2 - \Gamma_{\rm min}^2}$. This expression shows, for example, that for $\Gamma_{\rm
act}$. For each devil, obs} = \Gamma_{\rm min}$, we
chose a random closest encounter distance as should only consider $b =
\sqrt{\Phi}\ b_{\rm max}$, where $\Phi$ is 0$, i.e. only a
random variable uniformly distributed between 0 and 1. direct encounter. The
dashed, red line in Figure \ref{fig:n-Pobs_from_uniform_n-Pact} illustrates the result, showing agreement with the prediction within statistical uncertainties. integral to convert from $\rho(P_{\rm act}, \Gamma_{\rm act})$ to $\rho(P_{\rm obs}, \Gamma_{\rm obs})$ is following:
\begin{equation}
\label{eqn:convert_from_actual_to_observed_density}
\rho(P_{\rm obs}, \Gamma_{\rm obs}) = \int_{b = 0}^{\sqrt{\Gamma_{\rm obs}^2 - \Gamma_{\rm min}^2}} f\ \rho(P_{\rm act}(b), \Gamma_{\rm act}(b)) \dfrac{2b\ db}{\Gamma_{\rm obs}^2 - \Gamma_{\rm min}^2}.
\end{equation}