https://doi.org/10.5061/dryad.pc866t1wm

The frequencies of 137 different electron impact processes in the Martian nightside ionosphere---including ionization, dissociation, and excitation---are modeled separately. Species considered are: CO_2, N_2, Ar, O, and CO. Model parameters are: magnetic field strength, magnetic elevation angle, magnetic topology, solar wind pressure, and altitude. Characterization of the degradation of electron precipitation as the altitude decreases and atmospheric density increases has been calculated using a weighted number density of neutrals as its basis, and used to adjust frequencies. This calculation is explained in more detail in a manuscript currently in prep. Magnetic topology types are described in Xu et al. 2019, though here "night closed" and "night void" topologies are combined. Topology type codes are: 0-undefined, 1-day closed, 2-cross terminator closed, 3-night closed, 5-open to day, 6-open to night, 7-draped.

Description of the data and file structure

Data is in text format, organized into columns separated by whitespace with a 2 line header at the top.

Columns are: species (string, column width 4 characters); process(string, 30 chars); topology code (integer, 3 chars, described above); bottom, center, and top of altitude bin (3 integers, 5 chars each, in km); bottom, center, and top of solar wind pressure bin (3 floats, 13 chars each, in nPa); bottom, center, and top of magnetic field strength bin (3 floats, 13 chars each, in nT); bottom, center, and top of elevation angle bins (3 float, 7 chars each, in degrees); log10(ionization frequency fit) (float, 14 chars, in #/s)

Sharing/Access information

Data was derived from the following sources:

• MAVEN Insitu Key Parameters Data Bundle (https://pds-ppi.igpp.ucla.edu/search/view/?f=yes&id=pds://PPI/maven.insitu.calibrated)

  (LID = urn:nasa:pds:maven.insitu.calibrated)