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ISSN  2096-3955

CN  10-1502/P

Citation: Franco, A. M. S., Fränz, M., Echer, E., and Bolzan, M. J. A. (2019). Correlation length around Mars: A statistical study with MEX and MAVEN observations. Earth Planet. Phys., 3(6), 560–569.doi: 10.26464/epp2019051

2019, 3(6): 560-569. doi: 10.26464/epp2019051


Correlation length around Mars: A statistical study with MEX and MAVEN observations


National Institute for Space Research (INPE), Sao Jose dos Campos, Brazil


Max Planck Institute for Solar System Research, Goettingen, Germany


Federal University of Jataí, Jataí, Brazil

Corresponding author: Adriane Marques de Souza Franco,

Received Date: 2019-03-02
Web Publishing Date: 2019-11-01

Correlation lengths of ultra-low-frequency (ULF) waves around Mars were computed for the first time, using data from MEX (electron density from 2004 to 2015) and MAVEN (electron density and magnetic field from 2014 to 2016). Analysis of the MEX data found that, for the frequency range 8 to 50 mHz, correlation length in electron density varied between 13 and 17 seconds (temporal scale) and between 5.5 × 103 km and 6.8 × 103 km (spatial scale). For the MAVEN time interval, correlation length was found to vary between 11 and 16 seconds (temporal scale) and 2 × 103 – 4.5×103 km in spatial scale. In the magnetic field data, correlation lengths are observed to be between 8–15 seconds (temporal scale) and between 1 × 103 and 5 × 103 km (spatial scale) over the same frequency range. We observe that the cross sections of the plasma regions at the dayside of Mars are smaller than these correlation lengths in these regions in both analyses, where the correlation length derived from the MEX electron density data was between 5 and 25 times the size of the magnetosheath and the magnetic pile-up region (MPR), respectively. For MAVEN these ratios are about 4 (magnetosheath) and 11 (MPR) in electron density and between 1.5 and 5.5 for magnetic field data, respectively. These results indicate that waves at the magnetosheath/MPR can be related to oscillations in the upper ionosphere. In a local region, wave trains may cause resonance effects at the planetary ionopause, which consequently contributes to the enhanced ion escape from the atmosphere.

Key words: Mars induced magnetosphere, ULF waves, correlation length

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Correlation length around Mars: A statistical study with MEX and MAVEN observations

Adriane Marques de Souza Franco, Markus Fränz, Ezequiel Echer, Mauricio José Alves Bolzan