Flame like effect in Tikz

main.tex

\documentclass{article}
\usepackage[dvipsnames]{xcolor}
\usepackage{tikz} % Required for creating graphics

\begin{document}

\section*{Example of a `Flame' like effect in Tikz}

\definecolor{flameOuter}{HTML}{33AAFF}

\begin{center}
  \begin{tikzpicture}
    \begin{scope}
      \clip (0,0) -- (6,0) arc (0:180:6cm) -- cycle;
      \fill[inner color=white, outer color=flameOuter] (0,0) ellipse (1cm and 6cm);
    \end{scope}
  \end{tikzpicture}
\end{center}

\end{document}