Note
Go to the end to download the full example code.
Finding and Plotting PHI Data#
This example demonstrates how to search for, download, and plot Solar Orbiter PHI (Polarimetric and Helioseismic Imager) data using SunPy.
PHI SOAR Product Codes:#
- HRT (High Resolution Telescope)
phi-hrt-blos (Line-of-sight Magnetic Field)
phi-hrt-bmag (Total Magnetic Field Strength)
phi-hrt-binc (Inclination of Magnetic Field)
phi-hrt-bazi (Azimuth of Magnetic Field)
phi-hrt-icnt (Continuum Intensity)
phi-hrt-stokes (Stokes Parameters)
phi-hrt-vlos (Line-of-sight Velocity)
FDT (Full Disc Telescope)
Currently, only Continuum Intensity (phi-fdt-icnt) and Blos (phi-fdt-blos) are available in SOAR.
- Future releases will include:
phi-fdt-bmag
phi-fdt-binc
phi-fdt-bazi
phi-fdt-stokes
phi-fdt-vlos
import sunpy_soar
from sunpy.net import Fido, attrs as a
from astropy.time import Time
import sunpy.map
import sunpy.visualization.colormaps
import matplotlib.pyplot as plt
Searching for PHI-HRT Blos Data#
We first search for Solar Orbiter PHI-HRT (High Resolution Telescope) Blos data in a given time range. The search results will return metadata about available files.
t_start_hrt = Time('2024-03-23T20:00', format='isot', scale='utc')
t_end_hrt = Time('2024-03-23T23:59', format='isot', scale='utc')
search_results_phi_hrt = Fido.search(a.Instrument('PHI'), a.Time(t_start_hrt.value, t_end_hrt.value), a.soar.Product('phi-hrt-blos'))
To search for two products simultaneously, use the ‘|’ operator: results_phi = Fido.search(a.Instrument(‘PHI’), a.Time(t_start.value, t_end.value), (a.soar.Product(‘phi-hrt-blos’) | a.soar.Product(‘phi-hrt-icnt’)))
print(search_results_phi_hrt)
Results from 1 Provider:
3 Results from the SOARClient:
Instrument Data product Level Start time End time Filesize SOOP Name Detector Wavelength
Mbyte
---------- ------------ ----- ----------------------- ----------------------- -------- ---------------------------- -------- ----------
PHI phi-hrt-blos L2 2024-03-23 22:30:09.921 2024-03-23 22:31:35.697 17.001 L_BOTH_HRES_HCAD_Major-Flare HRT 6173.341
PHI phi-hrt-blos L2 2024-03-23 23:00:08.797 2024-03-23 23:01:34.683 17.001 L_BOTH_HRES_HCAD_Major-Flare HRT 6173.341
PHI phi-hrt-blos L2 2024-03-23 23:30:08.808 2024-03-23 23:31:34.930 17.001 L_BOTH_HRES_HCAD_Major-Flare HRT 6173.341
Fetching the First Available PHI-HRT File#
Once we have the search results, we fetch the first available file. When a path isnt passed as a kwarg, the files will save locally into sunpy/data. You can also pass path=’./your/path/to/save/PHI/data/’) to choose where to save the data.
files_phi_hrt = Fido.fetch(search_results_phi_hrt[0, 0])
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Loading and Plotting PHI-HRT Data#
The downloaded file is in FITS format. We load it as a sunpy.map.Map and adjust the plot settings for better visualization.
# Load the downloaded PHI-HRT Blos image
phi_hrt_blos_map = sunpy.map.Map(files_phi_hrt[0])
# Update the Plot settings
phi_hrt_blos_map.plot_settings['cmap'] = 'hmimag'
phi_hrt_blos_map.plot_settings['vmin'] = -1500
phi_hrt_blos_map.plot_settings['vmax'] = 1500
# Plot the PHI image
plt.figure(figsize=(8, 6))
phi_hrt_blos_map.plot()
plt.colorbar()
plt.title("SO/PHI-HRT Blos")
plt.show()
Searching for PHI-FDT Blos Data#
Now, we repeat the process for Solar Orbiter PHI-FDT (Full Disc Telescope) Blos data.
t_start_fdt = Time('2024-08-08T00:00', format='isot', scale='utc')
t_end_fdt = Time('2024-08-08T06:00', format='isot', scale='utc')
search_results_phi_fdt = Fido.search(a.Instrument('PHI'), a.Time(t_start_fdt.value, t_end_fdt.value), a.soar.Product('phi-fdt-blos'))
print(search_results_phi_fdt)
files_phi_fdt = Fido.fetch(search_results_phi_fdt[0, 0])#, path='./your/path/to/save/PHI/data/')
Results from 1 Provider:
1 Results from the SOARClient:
Instrument Data product Level Start time End time Filesize SOOP Name Detector Wavelength
Mbyte
---------- ------------ ----- ----------------------- ----------------------- -------- --------------------------------- -------- ----------
PHI phi-fdt-blos L2 2024-08-08 03:15:09.483 2024-08-08 03:16:09.323 2.589 R_FULL_LRES_LCAD_RS-Synoptics-Low FDT None
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Loading, Rotating, and Masking PHI-FDT Data#
The PHI-FDT data needs to be rotated and recentered for correct visualization. We also apply a mask to remove off-disc pixels.
phi_fdt_blos_map = sunpy.map.Map(files_phi_fdt[0]).rotate(recenter = True) # Rotate the image to the correct orientation
#clean up the off-disc pixels for better visualization
#here we find the coordinators that are on the solar disk and create a mask
hpc_coords = sunpy.map.all_coordinates_from_map(phi_fdt_blos_map)
mask = ~sunpy.map.coordinate_is_on_solar_disk(hpc_coords)
#create a sunpy map object, with a mask which is applied when plotting
phi_fdt_blos_map = sunpy.map.Map(phi_fdt_blos_map.data,phi_fdt_blos_map.meta, mask=mask)
# Update the Plot settings
phi_fdt_blos_map.plot_settings['cmap'] = 'hmimag'
phi_fdt_blos_map.plot_settings['vmin'] = -1500
phi_fdt_blos_map.plot_settings['vmax'] = 1500
# Plot the PHI image
plt.figure(figsize=(8, 6))
phi_fdt_blos_map.plot()
plt.colorbar()
plt.title("SO/PHI-FDT Blos")
plt.show()
Total running time of the script: (0 minutes 19.910 seconds)