MATLAB: Plotting a parker spiral

plottingspiral

Hello,

Does anyone possibly know how to plot a Parker (Archimedean) spiral in reference to heliospheric current sheets studied in space physics. If so, could anyone point me in the right direction of where to begin plotting it on Matlab?

Thank you!

Best Answer

Do you have an equation for it? Maybe you should look at quiver()? Or check out the MATLAB Plot Gallery

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MATLAB: Plotting a spiral in MATLAB knowing the start and end points and number of turns

This does the job (for an integer number of turns)


% given values
pos = [8 4 ;    % startpoint
       2 7 ] ;  % endpoint
nturns = 3 ;    % number of turns (integer value)
% engine
dp = diff(pos,1,1) ;
R = hypot(dp(1), dp(2)) ;
phi0 = atan2(dp(2), dp(1)) ;
phi = linspace(0, nturns*2*pi, 10000) ; % 10000 = resolution
r = linspace(0, R, numel(phi)) ;
x = pos(1,1) + r .* cos(phi + phi0) ;
y = pos(1,2) + r  .* sin(phi + phi0) ;
plot(x,y,'b-',pos(:,1),pos(:,2),'ro-') ; % nturns crossings, including end point

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MATLAB: Plotting a spiral in MATLAB knowing the start and end points and number of turns

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