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- Universidade de São PauloBR32 papers
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5 papers · 1 filter
Association of mid-infrared solar plages with Calcium K line emissions and magnetic structures
R. Marcon, P. Kaufmann, A. M. Melo +2
Solar mid-IR observations in the 8-15 micrometer band continuum with moderate angular resolution (18 arcseconds) reveal the presence of bright structures surrounding sunspots. Thes…
Observed flux density enhancement at submillimeter wavelengths during an X-class flare
G. Cristiani, C. G. Giménez de Castro, M. L. Luoni +3
We analyse the 30 October, 2004, X1.2/SF solar event that occurred in AR 10691 (N13 W18) at around 11:44 UT. Observations at 212 and 405 GHz of the Solar Submillimeter Telescope (S…
Statistical methods applied to composition studies of ultrahigh energy cosmic rays
F. Catalani, J. A. Chinellato, V. de Souza +2
The mass composition of high energy cosmic rays above eV is a crucial issue to solve some open questions in astrophysics such as the acceleration and propagation mechanis…
A thin disk in higher dimensional space-time and dark matter interpretation
Carlos H. Coimbra-Araujo, Patricio S. Letelier
We find a family of exact solutions of Einstein equations describing the field of a static axisymmetric thin disk living in six-dimensional space-time. In particular, we study the…
Alternative energy estimation from the shower lateral distribution function
Vitor de Souza, Carlos O. Escobar, Joel Brito +2
The surface detector technique has been successfully used to detect cosmic ray showers for several decades. Scintillators or Cerenkov water tanks can be used to measure the number…