| Full text | |
| Author(s): |
de Souza Franco, Adriane Marques
[1]
;
Fraenz, Markus
[2]
;
Echer, Ezequiel
[1]
;
Alves Bolzan, Mauricio Jose
[3]
Total Authors: 4
|
| Affiliation: | [1] Natl Inst Space Res INPE, Sao Jose Dos Campos, SP - Brazil
[2] Max Planck Inst Solar Syst Res, Gottingen - Germany
[3] Fed Univ Jatai, Jatai - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | EARTH AND PLANETARY PHYSICS; v. 3, n. 6, p. 560-569, NOV 2019. |
| Web of Science Citations: | 1 |
| Abstract | |
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 x 10(3) km and 6.8 x 10(3) km (spatial scale). For the MAVEN time interval, correlation length was found to vary between 11 and 16 seconds (temporal scale) and 2 x 10(3) - 4.5 x 10(3) km in spatial scale. In the magnetic field data, correlation lengths are observed to be between 8-15 seconds (temporal scale) and between 1 x 10(3) and 5 x 10(3) 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. (AU) | |
| FAPESP's process: | 17/00516-8 - A study on electron oscillations in the magnetosheath of mars with mars express observations |
| Grantee: | Adriane Marques de Souza Franco |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 16/10794-2 - Study on Electron Oscilations in the Magnetosheath of Mars |
| Grantee: | Adriane Marques de Souza Franco |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 18/21657-1 - Study of Jupiter magnetospheric auroral radio activity variability |
| Grantee: | Ezequiel Echer |
| Support Opportunities: | Regular Research Grants |