A5034217724- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Solar Radiation and Photovoltaics
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Spacecraft Design and Technology
- History and Developments in Astronomy
- Advanced Thermodynamics and Statistical Mechanics
- Radio Astronomy Observations and Technology
- Spacecraft and Cryogenic Technologies
- Atmospheric Ozone and Climate
- Astronomical Observations and Instrumentation
Universidade Presbiteriana Mackenzie
2016-2024
Observatoire de la Côte d’Azur
2022-2023
Centre National de la Recherche Scientifique
2022-2023
Université Côte d'Azur
2022
<ns3:p>Observations at (sub-)millimeter wavelengths offer a complementary perspective on our Sun and other stars, offering significant insights into both the thermal magnetic composition of their chromospheres. Despite fundamental progress in observations Sun, some important aspects require diagnostic capabilities that are not offered by existing observatories. In particular, simultaneous radiation continuum across an extended frequency range would facilitate mapping different layers thus...
Observations at (sub-)millimeter wavelengths offer a complementary perspective on our Sun and other stars, offering significant insights into both the thermal magnetic composition of their chromospheres. Despite fundamental progress in observations Sun, some important aspects require diagnostic capabilities that are not offered by existing observatories. In particular, simultaneously radiation continuum across an extended frequency range would facilitate mapping different layers thus...
<ns3:p>Observations at (sub-)millimeter wavelengths offer a complementary perspective on our Sun and other stars, offering significant insights into both the thermal magnetic composition of their chromospheres. Despite fundamental progress in observations Sun, some important aspects require diagnostic capabilities that are not offered by existing observatories. In particular, simultaneously radiation continuum across an extended frequency range would facilitate mapping different layers thus...
Polar brightening of the Sun at radio frequencies has been studied for almost fifty years and yet a disagreement persists between solar atmospheric models observations. Some observations reported values much smaller than expected obtained from models, with discrepancies being particularly large millimeter wavelengths. New clues to calibrate can be advent Atacama Large Millimeter/submillimeter Array (ALMA) interferometer. In this work, we analyzed lower limit polar observed 100 230 GHz by...
Abstract While direct magnetic field measurements are rare for slowly rotating stars, spots observed during planetary transits provide a potential indicator of activity on stellar surfaces. Moreover, the rotation surface can be probed by monitoring spots’ position with time in subsequent transits. This study investigates dynamic interplay rotational shear and rate six stars spectral types F to M, all hosting exoplanets CoRoT space mission, except one binary star from Kepler. The analysis,...
Abstract At subterahertz frequencies—i.e., millimeter and submillimeter wavelengths—there is a gap in measurements of the solar radius, as well other parameters atmosphere. As observational wavelength changes, radius varies because altitude dominant electromagnetic radiation produced at different heights Moreover, variations throughout long time series are indicative changes atmosphere that may be related to cycle. Therefore, an important parameter for calibration atmospheric models enabling...
The Sun and other solar-type stars have magnetic fields that permeate their interior surface, extends through the interplanetary medium, is main driver of stellar activity. Stellar activity affects physical processes conditions medium orbiting planets. Coronal mass ejections (CMEs) are most impacting these phenomena in near-Earth space weather, consist plasma clouds, with field, ejected from solar corona. Precisely predicting trajectory CMEs crucial determining whether a CME will hit planet...
Measurements of the radius and limb brightening Sun provide important information about solar atmosphere structure temperature. The increases as observation at radio frequency decreases, indicating that each emission originates higher in atmosphere. Thus, different layers can be probed by observing multiple wavelengths. In this work, we determined average 100, 212, 230, 405 GHz, using data from Solar Submillimeter Telescope ALMA's single-dish observations. For first time, values for...
Context. Starspots, regions of strong magnetic fields, serve as indicators stellar activity and the dynamo mechanism at play in interior stars. The fields main-sequence stars a crucial role driving activity. An effective approach to better understanding lies detailed characterisation starspot properties. Aims. We propose new method for estimating starspots that employs modelling techniques planetary transit mapping, which provides estimates size, intensity, location spots on photosphere....
Abstract The stellar magnetic field is the driver of activity in star and can trigger energetic flares, CMEs ionized wind. These phenomena, specially CMEs, may have an important impact on magnetosphere atmosphere orbiting planets. To predict whether a CME will planet, effects background CME's trajectory must be taken into account. We used MHD code ForeCAT – model for deflection due to forces perform numerical simulations being launched from both Sun Kepler-63, which young, solar-like with...
Abstract The visible surface of the Sun, or photosphere, is defined as solar radius in optical spectrum range located at 696,000 km (Cox et al. (Ed. 2015)). However, altitude increases, dominant electromagnetic radiation emitted other frequencies. Our aim to measure frequencies 212 GHz and 405 through out a cycle and, therefore, where these emissions are generated that variation along years. Also we tried verify dependence on activity cycle, which can be good indicator changes occur...
Abstract Solar-type stars, including the Sun, have magnetic fields that extend from their interiors to surface and beyond, influencing both stellar activity interplanetary medium. Magnetic phenomena, such as coronal mass ejections (CMEs), significantly impacts space weather. These CMEs, composed of plasma clouds with ejected corona, pose a potential threat planets by affecting magnetosphere atmosphere. Despite advancements in detecting detection remains limited. We focus on understanding CME...