§ Interests
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Magnetohydrodynamics (MHD), Plasma Physics
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Hydrodynamic and Magnetohydrodynamic Shocks and Waves
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Magnetic Reconnection
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Magnetic Flux Tubes
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Current Sheets
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Modeling and Simulations
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Solar Physics
§ Current Project
I am a Ph.D candidate doing research in Solar Physics. My advisor is Professor Dana W. Longcope (see his homepage, here)
My project involves magnetic thin-flux-tube (TFT) modeling and simulation.
We proposed modified equations that describe thin flux tubes embedded in a magnetic field background. We analyze tube dynamics after they have been reconnected in a Patchy region.
To study these tubes, I developed
a code called DEFT that simulates the evolution of two post-reconnected thin flux tubes that move in opposite directions.
With this code it is possible to follow all the relevant state variables, like density, pressure, temperature, magnetic field, etc. The new physics we have found
is fascinating (see some results in our papers, here)
Why do I study magnetic reconnection?: Firstly, because it is a lot of fun (yes, I said fun).
And secondly, because it concerns our daily lives. It might seem that this theoretical work has nothing to do with
life and people. On the contrary, it is widely believed that magnetic reconnection is directly related to flares and coronal mass ejections from the Sun. This events
release enormous amounts of energy and particles that in some cases might reach the Earth, affecting telecommunications, damaging equipment, creating power shortages,
and even hurting astronauts in space(*) (on the positive side, they are the cause of beautiful auroras). Therefore, understanding magnetic reconnection in detail
may allow us to predict these powerful magnetic storms, and give us some time to prevent damages.
I am working on a little part of the big puzzle, and every part is necessary to solve it.
Here there are some cartoons that illustrate one of the simplest set ups for my simulations:
Cartoon that shows the initial state for magnetic reconnection.
Cartoon that shows a finite time after magnetic reconnection.
Reconnected tubes have moved in opposite directions.
(*) Read this article from NASA:
“Severe Space Weather”
§ Refereed Publications
Solar Physics:
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D. W. Longcope, S. E. Guidoni, and M. G. Linton, “Gas-dynamic shock heating of post-flare loops due to retraction following localized, impulsive reconnection”, The Astrophysical Journal Letters 690, Issue 1, (2009) pp. L18-L22 .
Surface Science:
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C. De Micco, S. E. Guidoni, D. A. Mirabella, and C. M. Aldao, “Surface roughening due to adsorbates ”, Journal of Molecular Catalysis A: Chemical 228, Issue 1-2, (2005) pp. 111-115
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C. M. Aldao, S. E. Guidoni, G. J. Xu, Koji S. Nakayama, and J.H. Weaver, “Monte Carlo modeling of Si(1 0 0) roughening due to adsorbate-adsorbate repulsion”, Surface Science 551, Issue 1-2, (2004) pp. 143-149
Polymers. Chains of Monomers:
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S. E. Guidoni, H. O. Mártin, and C. M. Aldao,“Discretized model for diffusion of a chain in one dimension”, Physical Review E 67 , Issue 3 (2003)
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S. E. Guidoni, H. O. Mártin, and C. M. Aldao, “Anomalous viscosity exponent in a discretized model for a chain diffusion in one dimension”, Eur. Phys. J. E 7 , Issue 3, (2002) pp. 291-295
Random Walks:
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S. E. Guidoni, and C. M. Aldao, “On diffusion, drift and the Einstein relation”, Eur. J. Phys. 23 (2002) 395-402
§ Solar Physics Resources
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www.SolarMonitor.org
(These pages contain near-real time and archived information on active regions and solar activity)
© 2008 Silvina Guidoni
Last updated: January 02, 2009
Feedback or error reporting. Thank you.