A5049087998- Ionosphere and magnetosphere dynamics
- GNSS positioning and interference
- Earthquake Detection and Analysis
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Radio Astronomy Observations and Technology
- Meteorological Phenomena and Simulations
- Advanced SAR Imaging Techniques
- Seismic Waves and Analysis
- Radar Systems and Signal Processing
- earthquake and tectonic studies
- Atmospheric Ozone and Climate
- Satellite Communication Systems
- Seismic Imaging and Inversion Techniques
- Aerospace Engineering and Energy Systems
- Cryospheric studies and observations
- Atmospheric aerosols and clouds
- Precipitation Measurement and Analysis
- Astrophysics and Cosmic Phenomena
- Soil Moisture and Remote Sensing
- Planetary Science and Exploration
- Geophysical Methods and Applications
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Magnetic confinement fusion research
Pontifical Catholic University of Peru
2021-2025
Instituto Geofísico del Perú
2014-2023
Cornell University
2023
Leibniz Institute of Atmospheric Physics at the Rostock University
2023
University of Rostock
2023
Forum Solidaridad Perú
2021
Institut Franco-Allemand de Recherches de Saint-Louis
2017-2019
Université de Poitiers
2016-2017
XLIM
2016
University of Illinois Urbana-Champaign
2004-2010
Abstract The mesosphere and lower thermosphere (MLT) region is dominated globally by dynamics at various scales: planetary waves, tides, gravity stratified turbulence. latter two can coexist be significant horizontal scales less than 500 km, that are difficult to measure. This study presents a recently deployed multistatic specular meteor radar system, SIMONe Peru, which used observe these scales. radars positioned around the Jicamarca Radio Observatory, located magnetic equator. Besides...
Multiple-input multiple-output (MIMO) radar techniques make use of multiple transmitters and receivers to improve the spatial characterization targets. In case where Bragg scattering k <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">→</sup> -vector can be assumed same for all transmit-receive paths, MIMO methods seen as a way increasing number effective receivers. last decades, there has been scientific interest in determining characteristics...
Abstract We used reanalyzed Jicamarca radar measurements to study the response of equatorial ionospheric electrodynamics and spread F during main phase large September 2017 geomagnetic storm. Our observations near dusk on 7 show very upward drifts followed by a short‐lived downward drift perturbation that completely suppressed lower region plasma irregularities severely decreased backscattered power from higher altitude F. suggest this westward electric field is most likely magnetospheric...
Abstract We conducted a comprehensive analysis of the vertical drifts and equatorial spread F (ESF) measurements made by Jicamarca incoherent scatter radar (ISR) between 1994 2013. The ISR allowed us to construct not only updated climatological curves quiet‐time plasma but also time‐versus‐height maps ESF occurrence over past two solar cycles. These better relate observed patterns features in drift than previously possible. identified an excessively high post‐midnight region irregularities...
Abstract The middle atmosphere over South America, particularly above the Andes mountain range, is known as one of most dynamically active regions in world. Previous studies have investigated wave dynamics at mesosphere and lower thermosphere (MLT) altitudes within this region, but only a handful them made use continuous measurements provided by specular meteor radars (SMRs). Furthermore, it was until recently that MLT horizontal wind gradients were estimated for first time using Spread...
Abstract The eruption of the Hunga Tonga Ha’apai volcano on 15 January 2022 significantly impacted lower and upper atmosphere globally. Using multi-instrument observations, we described disturbances from sea surface to ionosphere associated with atmospheric waves generated by volcanic eruption. Perturbations were detected in pressure, horizontal magnetic field, equatorial electrojet (EEJ), ionospheric plasma drifts, total electron content (TEC), mesospheric thermospheric (MLT) neutral winds,...
Abstract Previous studies of the Earth's low‐latitude ionosphere using in situ measurements made by sensors on Communication/Navigation Outage Forecasting System (C/NOFS) satellite showed an unexpected predominance equatorial spread F (ESF) events postmidnight sector during June and December solstice months 2008–2009 deep solar minimum. It has been suggested that these might have driven unusual behavior plasma drifts, which abnormal upward peak around midnight same period. We use coherent...
Abstract During geomagnetically quiet and solar minimum conditions, spatial variations of the early morning thermosphere‐ionosphere (TI) system are expected to be mainly governed by wave dynamics. To study postmidnight dynamical coupling, we investigated equatorial ionization anomaly (EIA) using Global‐scale Observations Limb Disk (GOLD) measurements OI‐135.6 nm nightglow emission global navigation satellite (GNSS)‐based total electron content (TEC) maps. The EIA structures in over American...
A general framework for the incoherent scatter radar spectral theories is presented in terms of generalized Nyquist theorem, Kramers-Kronig relations, and characteristic functions random charge-carrier displacements ionosphere. Specific models typical ionospheric conditions are derived discussed. The discussions focus on effect Coulomb collisions magnetized plasmas, which a topic current interest treated further detail companion paper by authors, as well different combinations physical...
Incoherent scatter (IS) spectral models for collisional and magnetized F-region plasmas are developed based on a general framework described in part I of this paper the statistics simulated particle trajectories. In simulations, Langevin update equation is used to describe motion charge carriers undergoing Coulomb collisions. It shown that random displacements oxygen ions can be characterized as Brownian-motion process with Gaussian distributed displacement vectors. Electron displacements,...
A novel technique for radar‐imaging inversions is proposed which leverages ideas from the emerging field of compressed sensing. This new method takes advantage transform sparsity inherent in natural images. Theoretical recovery results are promising and borne out by simulations this outperforms Capon's Maximum Entropy method. Preliminary using data collected at Jicamarca Radio Observatory also presented.
Abstract Ionospheric state parameters including plasma number density and vector drift velocity profiles were measured at the Jicamarca Radio Observatory during a campaign running from 12 to 18 April 2013. Neutral winds by red‐line Fabry Perot interferometer Jicamarca. Coherent radar backscatter irregularities associated with equatorial spread F (ESF) was also recorded. A numerical simulation of ionospheric irregularities, initialized forced using parameterizations derived combination...
A set of instruments to measure several physical, microphysical, and radiative properties the atmosphere clouds are essential identify, understand and, subsequently, forecast prevent effects extreme meteorological events, such as severe rainfall, hailstorms, frost events high pollution that can occur with some regularity in central Andes Peru. However, like many other Latin American countries, Peru lacks an adequate network stations identify analyze events. To partially remedy this...
Abstract We present observations of the topside ionosphere made at Jicamarca Radio Observatory in March and September 2013, using a full‐profile analysis approach. Recent updates to methodology employed are also described. Measurements plasma number density, electron ion temperatures, hydrogen helium fractions up 1500 km altitude presented for 3 days September. The main features include sawtooth‐like diurnal variation h t , transition height where O + fraction falls 50%, appearance weak He...
Abstract We present results from a continuing effort to simulate equatorial spread F (ESF) using observations the Jicamarca Radio Observatory near Lima, Peru. measures vertical and zonal plasma drifts along with number density profiles overhead. The are used initialize three‐dimensional regional model of ionosphere capable simulating irregularities produced during ESF conditions. measurements drive numerical simulation continuously. Neutral winds derived new Horizontal Wind Model '14...
Abstract A small network of HF beacon transmitters and receivers has been deployed in Peru for specifying the F region ionosphere sector. The effort is motivated by ionospheric disturbances associated with equatorial spread (ESF) specifically arising under inauspicious conditions ESF as determined numerical simulations. beacons operate at dual frequencies (2.72 3.64 MHz). They are CW but incorporate pseudorandom noise (PRN) coding so that group delays links can be measured. Other observables...