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 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')