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Your search keyword '"Yasir Soobiah"' showing total 3 results
Start Over Author "Yasir Soobiah" Topic geophysics
3 results on '"Yasir Soobiah"'

2. The Twisted Configuration of the Martian Magnetotail: MAVEN Observations

Author

Gina A. DiBraccio, Janet G. Luhmann, Shannon M. Curry, Jared R. Espley, Shaosui Xu, David L. Mitchell, Yingjuan Ma, Chuanfei Dong, Jacob R. Gruesbeck, John E. P. Connerney, Yuki Harada, Suranga Ruhunusiri, Jasper S. Halekas, Yasir Soobiah, Takuya Hara, David A. Brain, and Bruce M Jakosky

Subjects
Geophysics
Abstract

Measurements provided by the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft are analyzed to investigate the Martian magnetotail configuration as a function of interplanetary magnetic field (IMF) BY. We find that the magnetotail lobes exhibit a ~45° twist, either clockwise or counterclockwise from the ecliptic plane, up to a few Mars radii downstream. Moreover, the associated cross‐tail current sheet is rotated away from the expected location for a Venus‐like induced magnetotail based on nominal IMF draping. Data‐model comparisons using magnetohydrodynamic simulations are in good agreement with the observed tail twist. Model field line tracings indicate that a majority of the twisted tail lobes are composed of open field lines, surrounded by draped IMF. We infer that dayside magnetic reconnection between the crustal fields and draped IMF creates these open fields and may be responsible for the twisted tail configuration, similar to what is observed at Earth.

Published
2018
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3. A comet engulfs Mars: MAVEN observations of comet Siding Spring's influence on the Martian magnetosphere

Author

Jared R. Espley, Gina A. DiBraccio, John E. P. Connerney, David Brain, Jacob Gruesbeck, Yasir Soobiah, Jasper Halekas, Michael Combi, Janet Luhmann, Yingjuan Ma, Yingdong Jia, and Bruce Jakosky

Subjects
Martian, Physics, Geophysics, Comet tail, Comet nucleus, Comet dust, Interstellar comet, Comet, General Earth and Planetary Sciences, Astronomy, Mars Exploration Program, Atmosphere of Mars, Astrobiology
Abstract

The nucleus of comet C/2013 A1 (Siding Spring) passed within 141,000 km of Mars on 19 October 2014. Thus, the cometary coma and the plasma it produces washed over Mars for several hours producing significant effects in the Martian magnetosphere and upper atmosphere. We present observations from Mars Atmosphere and Volatile EvolutioN's (MAVEN's) particles and field's instruments that show the Martian magnetosphere was severely distorted during the comet's passage. We note four specific major effects: (1) a variable induced magnetospheric boundary, (2) a strong rotation of the magnetic field as the comet approached, (3) severely distorted and disordered ionospheric magnetic fields during the comet's closest approach, and (4) unusually strong magnetosheath turbulence lasting hours after the comet left. We argue that the comet produced effects comparable to that of a large solar storm (in terms of incident energy) and that our results are therefore important for future studies of atmospheric escape, MAVEN's primary science objective.

Published
2015

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