Results 51 to 60 of about 6,894 (155)

Can We Intercalibrate Satellite Measurements by Means of Data Assimilation? An Attempt on LEO Satellites

Space Weather
Low Earth Orbit satellites offer extensive data of the radiation belt region, but utilizing these observations is challenging due to potential contamination and difficulty of intercalibration with spacecraft measurements at Highly Elliptic Orbit that can
Angélica M. Castillo, Yuri Y. Shprits, Nikita A. Aseev, Artem Smirnov, Alexander Drozdov, Sebastian Cervantes, Ingo Michaelis, Marina García Peñaranda, Dedong Wang   +8 more
doaj   +1 more source

Low‐harmonic magnetosonic waves observed by the Van Allen Probes [PDF]

Journal of Geophysical Research: Space Physics, 2015
AbstractPurely compressional electromagnetic waves (fast magnetosonic waves), generated at multiple harmonics of the local proton gyrofrequency, have been observed by various types of satellite instruments (fluxgate and search coil magnetometers and electric field sensors), but most recent studies have used data from search coil sensors, and many have ...
J. L Posch, M. J. Engebretson, C. N. Olson, S. A. Thaller, A. W. Breneman, J. R. Wygant, S. A. Boardsen, C. A. Kletzing, C. W. Smith, G. D. Reeves   +9 more
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Semiannual Variation in radiation belts particle fluxes: Van Allen probes observations [PDF]

, 2018
Abstract. The Semiannual Variation (SAV) is an annual pattern characterized by maxima around the equinoxes and minima near solstices observed in many space weather parameters. Several authors have studied this variation in the electron fluxes of the magnetosphere, focusing only in a few energy levels.
Facundo L. Poblet, Francisco Azpilicueta
openaire   +3 more sources

Propagation and Dispersion of Lightning-Generated Whistlers Measured From the Van Allen Probes

Frontiers in Physics, 2021
We study the propagation and attenuation of lightning-generated whistler (LGW) waves in near-Earth space (L ≤ 3) through the statistical study of three specific quantities extracted from data recorded by NASA’s Van Allen Probes mission, from 2012 to 2019:
J.-F. Ripoll, J.-F. Ripoll, T. Farges, D. M. Malaspina, D. M. Malaspina, G. S. Cunningham, G. B. Hospodarsky, C. A. Kletzing, J. R. Wygant   +8 more
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A Survey of EMIC Waves in Van Allen Probe Data

Journal of Geophysical Research: Space Physics
AbstractUsing an automated novel approach we conduct a reproducible systematic survey of electromagnetic ion cyclotron wave activity detected by Van Allen Probe B during the time period 2013 January 1–2019 July 15. We identify approximately 500 hr of EMIC wave activity, an occurrence rate of ∼ 0.85%.
Andrew Inglis, Kyle Robert Murphy, Alexa J. Halford   +2 more
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MHD‐Test Particles Simulations of Moderate CME and CIR‐Driven Geomagnetic Storms at Solar Minimum

Space Weather, 2021
As part of the Whole Heliosphere and Planetary Interactions initiative, contrasting drivers of radiation belt electron response at solar minimum have been investigated with MHD‐test particle simulations for the May 13–14, 2019 Coronal Mass Ejection (CME)‐
Mary K. Hudson, Scot R. Elkington, Zhao Li, Maulik Patel, Kevin Pham, Kareem Sorathia, Alex Boyd, Allison Jaynes, Alexis Leali   +8 more
doaj   +1 more source

Observations of Time-Domain Structures in the Plasmaspheric Plume by Van Allen Probes

Magnetochemistry, 2023
Time-domain structures (TDS), manifested as ≥ 1 ms pulses with significant parallel electric fields, play an important role in accelerating electrons in the field-aligned direction. These precipitated electrons contribute to the formation of aurora.
Shangchun Teng, Huayue Chen, Qiang Zhang, Desheng Han   +3 more
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The Evolving Space Weather System—Van Allen Probes Contribution

Space Weather, 2014
AbstractThe overarching goal and purpose of the study of space weather is clear—to understand and address the issues caused by solar disturbances on humans and technological systems. Space weather has evolved in the past few decades from a collection of concerned agencies and researchers to a critical function of the National Weather Service of NOAA ...
L. J. Zanetti, B. H. Mauk, N. J. Fox, R. J. Barnes, M. Weiss, T. S. Sotirelis, N.‐E. Raouafi, R. L. Kessel, H. N. Becker   +8 more
openaire   +1 more source

A machine-learning-based electron density (MLED) model in the inner magnetosphere

Earth and Planetary Physics, 2022
Plasma density is an important factor in determining wave-particle interactions in the magnetosphere. We develop a machine-learning-based electron density (MLED) model in the inner magnetosphere using electron density data from Van Allen Probes between ...
QingHua Zhou, YunXiang Chen, FuLiang Xiao, Sai Zhang, Si Liu, Chang Yang, YiHua He, ZhongLei Gao   +7 more
doaj   +1 more source

Quasiperiodic Emissions: Fine Structure Corresponding to a Bouncing Wave

Geophysical Research Letters
Quasiperiodic (QP) emissions are whistler‐mode electromagnetic waves observed in the Earth's inner magnetosphere whose intensity has a nearly periodic time modulation with typical modulation periods on the order of minutes. Some events exhibit, on top of
F. Němec, O. Santolík, G. B. Hospodarsky, W. S. Kurth   +3 more
doaj   +1 more source