CHAMP and Swarm solar activity- and height-scaled polar cap plasma density measurements

Solar activity- and height-adjusted plasma density measurements in the polar cap (i.e., above 80° latitude in Modified Apex₁₁₀ coordinates) from the Swarm and CHAMP satellites. covering the entire CHAMP mission period (2002–2009) and the Swarm mission period from launch through February 2020.

Plasma density measurements are scaled to a nominal solar activity level of <F10.7>₂₇ = 80 sfu, and an altitude of 500 km, as described in Hatch et al. (submitted to JGR: Space Physics; ESSOAr pre-print) 

This dataset was prepared as a part of the "Swarm+ Coupling High-Low Atmosphere Interactions: Ion Outflow" project (project website) (ESA website), and is funded by European Space Agency Contract #4000126731.

Data are stored in HDF5 format as a Python Pandas dataframe. They can be loaded into Python via the following.

import pandas as pd

df = pd.read_hdf('CHAMP_Swarm_polarcap_adjDensity.hdf',key='df')

The data columns are

• 'NeAdj'    : Solar activity- and height-adjusted plasma density (cm^-3)
• 'a110lat'  : Modified Apex₁₁₀ latitude (deg)
• 'a110lon' : Modified Apex₁₁₀ longitude (deg)
• 'mlt'         : Modified Apex₁₁₀ magnetic local time
• 'h_km'     : satellite altitude (km)
• 'gclat'      : geocentric latitude (deg)
• 'gclon'     : geocentric longitude (deg)
• 'sat'         : satellite identifier (string, one of 'A', 'B',' 'C', or 'CHAMP')