INVESTIGADORES
BERTUCCI Cesar
artículos
Título:
Temporal Variability of Waves at the Proton Cyclotron Frequency Upstream from Mars: Implications for Mars Distant Hydrogen Exosphere
Autor/es:
C. BERTUCCI, N. ROMANELLI, J.Y. CHAUFRAY, D. GOMEZ, C. MAZELLE, M. DELVA, R. MODOLO, F. GONZÁLEZ-GALINDO, D. A. BRAIN.
Revista:
GEOPHYSICAL RESEARCH LETTERS
Editorial:
AMER GEOPHYSICAL UNION
Referencias:
Lugar: Washington DC; Año: 2013
ISSN:
0094-8276
Resumen:
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We report on the temporal variability of the occurrence of waves at the
local proton cyclotron frequency upstream from the Martian bow shock from Mars
Global Surveyor observations during the first aerobraking and science phasing
orbit periods. Observations at high southern latitudes during minimum-to-mean
solar activity show that the wave occurrence rate is significantly higher
around perihelion/southern summer solstice than around the spring and autumn
equinoxes. A similar trend is observed in the hydrogen (H) exospheric density
profiles over the Martian dayside and South Pole obtained from a model including
UV thermospheric heating effects. In spite of the complexity in the ion pick-up
and plasma wave generation and evolution processes, these results support the
idea that variations in the occurrence of waves could be used to study the
temporal evolution of the distant Martian H corona and its coupling with the
thermosphere at altitudes currently inaccessible to direct measurements.
