Combining off-limb and disk maps#
This example combines creating a composite plot with masking out the
solar disk. The purpose is to introduce users to the plotting process
required to overlay multiple maps that have been modified with other
sunpy functions. The resulting plot in this tutorial shows information
on the upper photosphere, quiet corona, and magnetogram contours.
import matplotlib.pyplot as plt import astropy.units as u import sunpy.data.sample from sunpy.map import Map from sunpy.map.maputils import all_coordinates_from_map, coordinate_is_on_solar_disk
Let’s import sample data representing the three types of data we want to overlay: AIA 1600 (upper photosphere), AIA 171 (quiet corona), and HMI data (magnetic fields in the photosphere).
Next, let’s mask out the solar disk of the AIA 171 image since we will be overlaying the AIA 1600 photosphere.
Before we plot the composite image, let’s define the contour levels that will be applied to the HMI image. Also, grab the AIA 171 colormap to use with the AIA 1600 image to better match the images.
Now, create the plot by overlaying the maps and contours. Note that
clip_interval is being defined to highlight the coronal features of the
scaled AIA 171 map and the AIA 1600 map is autoaligned to the AIA 171 WCS
fig = plt.figure() ax = fig.add_subplot(projection=scaled_map) scaled_map.plot(axes=ax, clip_interval=(1, 99.95)*u.percent, cmap=colormap, zorder=0) aia_1600.plot(axes=ax, cmap=aia171_cmap, autoalign=True, zorder=1) hmi.draw_contours(axes=ax, levels=levels, zorder=2) ax.set_title("AIA 171 (off limb) + AIA 1600 (on disk) + HMI (contours)") plt.show()
Total running time of the script: (0 minutes 4.358 seconds)