Dataset for: "Identifying Alfvénic Modulation of Quasi-Static Potential Structures Above Aurora by Optical Methods"

Raw and processed data used in the paper "Identifying Alfvénic Modulation of Quasi-Static Potential Structures Above Aurora by Optical Methods". Files: 20170228025049r1_IMAGES_9500_10000.h5 (ASK1, file images are in Rayeigh) Keys: 'bkg', 'frames', and individual frame number keys (9500–10000) Attributes: 'deg_per_pix', 'description', 'sec_per_frame' 20170228025049r3_IMAGES_9500_10000.h5 (ASK3, file images are in Rayeigh) Keys: 'bkg', 'frames', and individual frame number keys (9500–10000) Attributes: 'deg_per_pix', 'description', 'sec_per_frame' 20170228025049_ENERGYFLUXmw_9500_10000_medfilt5.h5 Keys: 'energy', 'energyflux', 'frames' ASK1 and ASK3 images are median filtered (5x5 kernel) prior to calculating energy and energy flux. The energies are further filtered using a bilateral filter (described in the paper). Energy flux in mW/m^2. Energy in eV. HelmholtzDecomp_Efield_fromV_scaled_to_100km.h5 Keys: 'BC_fourier_coeffs', 'Exy_curlfree', 'Exy_divfree', 'phi', 'psi', 'y0' 'Exy_curlfree' and 'Exy_divfree' are obtained from the gradient of 'phi' and curl of 'psi', respectively. 'BC_fourier_coeffs' are the fitted fourier coefficients to generate the boundary conditions (described in the paper). Each entry of 'BC_fourier_coeffs' is 224 coefficients long, with the first 112 generating the boundaries for solving phi; the last 112 generate the boundaries for solving psi. Each block of 112 comprises 4 x 28 coefficients (one block of 28 for each boundary – left, top, right, bottom, in that order, for an array with [0,0] in the bottom left corner), and each block of 28 comprises 14 real and 14 imaginary fourier coefficients. 'y0' is the sum of square resiuals between the original electric field and the reconstruction (reconstruction = Exy_curlfree + Exy_divfree) for the solution in 'BC_fourier_coeffs'. velocities_scaled_to_100km.h5 Keys: 'metres_per_pixel', 'true_altitude', 'vx', 'vy' Velocities calculated using the TV-L1 optical flow algorithm, with modifications (see paper). Optical flow output is converted from pixels/frame to m/s using the frame rate (20 fps) and 'metres_per_pixel' at the emission altitude ('true_altitude'), and then magnetic-field-aligned projected to 100 km to give 'vx' and 'vy'.