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Mostrando 10 de un total de 32 resultados de la comunidad: Ciencias del Geoespacio y Astronomía. (0.069 segundos)

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Por | Valladares, C. E.; Sheehan, R. (American Geophysical Union, 2016-08-10)

Observations of conjugate MSTIDs using networks of GPS receivers in the American sector

This study has used total electron content (TEC) values from an extended network of GPS receivers and a highly developed processing to characterize the conjugacy of medium‐scale traveling ionospheric disturbances (MSTIDs) over the American continent. It was found that midlatitude nighttime MSTIDs, ...
- Medium‐scale traveling ionospheric disturbances
- Network of GPS receivers
- Perkins instability
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Por | Goncharenko, L.; Coster, A.; Rideout, W.; Chau Chong Shing, Jorge Luis; Liu, H. -L.; Valladares, C. E. (Instituto Geofísico del Perú, 2009)

Ionospheric variations during January 2009 stratospheric sudden warming

The stratospheric sudden warming peaking in January 2009 was the strongest and most prolonged on record. We report significant ionospheric variations is association with this event, which are especially pronounced at low latitudes. Large increase in the vertical drifts is observed at Jicamarca, ...
- Ionosphere
- Seasonal variations
- Stratosphere
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Por | Goncharenko, L.; Coster, A.; Chau Chong Shing, Jorge Luis; Valladares, C. E. (Instituto Geofísico del Perú, 2011)

Ionospheric effects of recent stratospheric sudden warmings

Recent studies have shown large variations in low-latitude ionospheric parameters occurring after stratospheric sudden warming events. We use observations of vertical ion drift from Jicamarca ISR and GPS total electron content data in the Western Hemisphere for winters of 2008-2009 and 2009-2010 to ...
- Ionosphere
- Ionization
- Stratosphere
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Por | Laskar, F. I.; Eastes, R. W.; Martinis, C. R.; Daniell, R. E.; Pedatella, N. M.; Burns, A. G.; McClintock, W.; Goncharenko, L. P.; Coster, A.; Milla, Marco; Wang, W.; Valladares, C. E.; Codrescu, M. V. (American Geophysical Union, 2020-07)

Early morning equatorial ionization anomaly from GOLD observations

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 the postmidnight dynamical coupling, we investigated the early morning equatorial ionization anomaly (EIA) ...
- Airglow
- Total electron content
- Thermosphere‐ionosphere dynamics
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Por | Chau Chong Shing, Jorge Luis; Hysell, D. L.; Valladares, C. E.; Meriwether, J. W. (Instituto Geofísico del Perú, 2010)

Instrumentation and science at Jicamarca and LISN for CAWSES-II TG4

Diapositivas presentadas en el 2010 CEDAR Workshop, University of Colorado, Boulder, CO, 20-25 June 2010.
- Ionosphere
- Magnetosphere
- Radar
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Por | Gopi Krishna, S.; Valladares, C. E.; Doherty, P.; Bullet, T.; Livingston, R. (Instituto Geofísico del Perú, 2009)

Studies of equatorial spread-F using LISN VIPIR

LISN, the Low Latitude Ionospheric Sensor Network, is a distributed observatory. LISN represents a closely coordinated geophysical instrument set, comprised of GPS receivers providing TEC values and scintillation measurements, magnetometers providing daytime ionospheric electric fields and Vertical ...
- Ionosphere
- Ionograms
- Geomagnetism
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Por | Akala, A. O.; Doherty, P. H.; Carrano, C. S.; Valladares, C. E.; Groves, K. M. (American Geophysical Union, 2012-07-25)

Impacts of ionospheric scintillations on GPS receivers intended for equatorial aviation applications

This study examines the impacts of ionospheric scintillations on GPS receivers that are intended for equatorial or transequatorial aviation applications. We analyzed GPS data that were acquired at Ascension Island during the Air Force Research Laboratory (AFRL) campaign of the solar maximum year of ...
- Aviation
- Ionospheric scintillations
- GPS
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Por | Valladares, C. E.; Sheehan, R.; Basu, S.; Kuenzler, H.; Espinoza, J. (American Geophysical Union, 1996-12-01)

The multi‐instrumented studies of equatorial thermosphere aeronomy scintillation system: Climatology of zonal drifts

A spaced-antenna scintillation system was installed at Ancon, Peru, in May 1994 to measure scintillation of 250-MHz signals from a geostationary satellite by three antennas spaced in the magnetic east-west direction. These measurements were used to establish the climatology of the zonal drift of the ...
- Scintillation
- Thermosphere
- Artificial satellites
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Por | Valladares, C. E.; Chau Chong Shing, Jorge Luis (American Geophysical Union, 2012-05-18)

The Low-Latitude Ionosphere Sensor Network: Initial results

The Low-Latitude Ionospheric Sensor Network (LISN) is a distributed observatory designed to nowcast the state and dynamics of the low-latitude ionosphere and to develop forecasts of the electric fields, densities, and equatorial spread F over the South American continent. The LISN observatory consists ...
- TEC enhancement
- Equatorial spread F
- Gravity wave
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Por | Goncharenko, L. P.; Coster, A. J.; Chau Chong Shing, Jorge Luis; Valladares, C. E. (American Geophysical Union, 2010-10-07)

Impact of sudden stratospheric warmings on equatorial ionization anomaly

We investigate the ionospheric response to several stratospheric sudden warming events which occurred in Northern Hemisphere winters of 2008 and 2009 during solar minimum conditions. We use GPS total electron content data in a broad latitudinal region at ±40° geographic latitude and a single longitude, ...
- Stratospheric sudden warming
- Equatorial Electrojet
- Equatorial ionosphere
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