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Van Allen Probes Bibliography is from August 2012 through September 2021 Notice:
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Found 15 entries in the Bibliography.
Showing entries from 1 through 15
| 2020 |
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The “zebra stripes” are peaks and valleys commonly present in the spectrograms of energetic particles trapped in the Earth s inner belt and slot region. Several theories have been proposed over the years to explain their generation, structure, and evolution. Yet, the plausibility of various theories has not been tested due to a historical lack of ground truth, including in situ electric field measurements. In this work, we leverage the new visibility offered by the database of Van Allen Probes electric drift measurements ... Lejosne, Solène; Mozer, Forrest; Published by: Journal of Geophysical Research: Space Physics Published on: 06/2020 YEAR: 2020 DOI: https://doi.org/10.1029/2020JA027889 zebra stripes; superposed epoch analysis; prompt penetration electric fields; Inner radiation belt; substorm; Van Allen Probes |
| 2019 |
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Satellite-based direct electric field measurements deliver crucial information for space science studies. Yet they require meticulous design and calibration. In-flight calibration of double-probe instruments is usually presented in the most common case of tenuous plasmas, where the presence of an electrostatic structure surrounding the charged spacecraft alters the geophysical electric field measurements. To account for this effect and the uncertainty in the boom length, the measured electric field is multiplied by a paramet ... Published by: Earth and Space Science Published on: 04/2019 YEAR: 2019 DOI: 10.1029/2018EA000550 DC electric field; double probe instrument; electric drift; plasmasphere; shorting factor; Van Allen Probes |
| 2018 |
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It has been reported that the dynamics of energetic (tens to hundreds of keV) electrons and ions is inconsistent with the theoretical picture in which the large-scale electric field is a superposition of corotation and convection electric fields. Combining one year of measurements by the Super Dual Auroral Radar Network, DMSP F-18 and the Van Allen Probes, we show that subauroral polarization streams are observed when energetic electrons have penetrated below L = 4. Outside the plasmasphere in the premidnight region, potenti ... Lejosne, ène; Kunduri, B.; Mozer, F.; Turner, D.; Published by: Geophysical Research Letters Published on: 04/2018 YEAR: 2018 DOI: 10.1029/2018GL077969 adiabatic invariants; drift paths; electric fields; injections; SAPS; Van Allen Probes |
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Magnetic activity dependence of the electric drift below L=3 More than two years of magnetic and electric field measurements by the Van Allen Probes are analyzed with the objective of determining the average effects of magnetic activity on the electric drift below L=3. The study finds that an increase in magnetospheric convection leads to a decrease in the magnitude of the azimuthal component of the electric drift, especially in the night-side. The amplitude of the slowdown is a function of L, local time MLT, and Kp, in a pattern consistent with the storm-time dynamics of the ionosphe ... Published by: Geophysical Research Letters Published on: 04/2018 YEAR: 2018 DOI: 10.1029/2018GL077873 electric drift; electric field; Inner radiation belt; ionospheric disturbance dynamo; plasmasphere; subcorotation; Van Allen Probes |
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Reply to Comment by Nishimura Et Al. Nishimura et al. (2010, https://doi.org/10.1126/science.1193186, 2011, https://doi.org/10.1029/2011JA016876, 2013, https://doi.org/10.1029/2012JA018242, and in their comment, hereafter called N18) have suggested that chorus waves interact with equatorial electrons to produce pulsating auroras. We agree that chorus can scatter electrons >10 keV, as do Time Domain Structures (TDSs). Lower-energy electrons occurring in pulsating auroras cannot be produced by chorus, but such electrons are scattered and accelerated by TDS. TDSs ... Mozer, F.; Hull, A.; Lejosne, S.; Vasko, I; Published by: Journal of Geophysical Research: Space Physics Published on: 03/2018 YEAR: 2018 DOI: 10.1002/2018JA025218 chorus cannot precipitate electrons observed in pulsating auroras; time domain structures cause electron precipitation in pulsating auroras; Van Allen Probes |
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Coordinates for Representing Radiation Belt Particle Flux Fifty years have passed since the parameter \textquotedblleftL-star\textquotedblright was introduced in geomagnetically trapped particle dynamics. It is thus timely to review the use of adiabatic theory in present-day studies of the radiation belts, with the intention of helping to prevent common misinterpretations and the frequent confusion between concepts like \textquotedblleftdistance to the equatorial point of a field line,\textquotedblright McIlwain\textquoterights L-value, and the trapped particle\textquoterights adia ... Published by: Journal of Geophysical Research: Space Physics Published on: 02/2018 YEAR: 2018 DOI: 10.1002/2017JA025053 |
| 2017 |
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Pulsating auroras produced by interactions of electrons and time domain structures Previous evidence has suggested that either lower band chorus waves or kinetic Alfven waves scatter equatorial kilovolt electrons that propagate to lower altitudes where they precipitate or undergo further low-altitude scattering to make pulsating auroras. Recently, time domain structures (TDSs) were shown, both theoretically and experimentally, to efficiently scatter equatorial electrons. To assess the relative importance of these three mechanisms for production of pulsating auroras, 11 intervals of equatorial THEMIS data a ... Mozer, F.; Agapitov, O.; Hull, A.; Lejosne, S.; Vasko, I; Published by: Journal of Geophysical Research: Space Physics Published on: 08/2017 YEAR: 2017 DOI: 10.1002/2017JA024223 |
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We examine a characteristic feature of the magnetosphere-ionosphere coupling, namely, the persistent and latitudinally narrow bands of rapid westward ion drifts called the Sub-Auroral Polarization Streams (SAPS). Despite countless works on SAPS, information relative to their durations is lacking. Here, we report on the first statistical analysis of more than 200 near-equatorial SAPS observations based on more than two years of Van Allen Probe electric drift measurements. First, we present results relative to SAPS radial loca ... Published by: Geophysical Research Letters Published on: 08/2017 YEAR: 2017 DOI: 10.1002/2017GL074985 duration; electric drift measurements; magnetosphere-ionosphere coupling; SAPS; Van Allen Probes |
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Plasmaspheric rotation is known to lag behind Earth rotation. The causes for this corotation lag are not yet fully understood. We have used more than two years of Van Allen Probe observations to compare the electric drift measured below L~2 with the predictions of a general model. In the first step, a rigid corotation of the ionosphere with the solid Earth was assumed in the model. The results of the model-observation comparison are twofold: (1) radially, the model explains the average observed geographic variability of the ... Lejosne, ène; Maus, Stefan; Mozer, F.; Published by: Geophysical Research Letters Published on: 07/2017 YEAR: 2017 DOI: 10.1002/2017GL074862 corotation; electric field; Ionosphere; plasmasphere; thermosphere; Van Allen Probes; wind |
| 2016 |
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The electric drift E \texttimes B/B2 plays a fundamental role for the description of plasma flow and particle acceleration. Yet it is not well-known in the inner belt and slot region because of a lack of reliable in situ measurements. In this article, we present an analysis of the electric drifts measured below L ~ 3 by both Van Allen Probes A and B from September 2012 to December 2014. The objective is to determine the typical components of the equatorial electric drift in both radial and azimuthal directions. The dependenc ... Published by: Journal of Geophysical Research: Space Physics Published on: 12/2016 YEAR: 2016 DOI: 10.1002/2016JA023613 electric drift; electric field; Inner radiation belt; plasmasphere; subcorotation; Van Allen Probes |
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We have used electric and magnetic measurements by Van Allen Probe B from 2013 to 2014 to examine the equatorial electric drift E \texttimes B/B2 at one field line coordinate set to Arecibo\textquoterights incoherent scatter radar location (L = 1.43). We report on departures from the traditional picture of corotational motion with the Earth in two ways: (1) the rotational angular speed is found to be 10\% smaller than the rotational angular speed of the Earth, in agreement with previous works on plasmaspheric notches, and (2 ... Published by: Geophysical Research Letters Published on: 07/2016 YEAR: 2016 DOI: 10.1002/2016GL069875 corotation; electric field; Inner radiation belt; Ionosphere; plasmasphere; Van Allen Probes |
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We examine a characteristic effect, namely, the ubiquitous appearance of structured peaks and valleys called zebra stripes in the spectrograms of energetic electrons and ions trapped in the inner belt below L ~ 3. We propose an explanation of this phenomenon as a purely kinematic consequence of particle drift velocity modulation caused by F region zonal plasma drifts in the ionosphere. In other words, we amend the traditional assumption that the electric field associated with ionospheric plasma drives trapped particle distri ... Lejosne, Solène; Roederer, Juan; Published by: Journal of Geophysical Research: Space Physics Published on: 01/2016 YEAR: 2016 DOI: 10.1002/2015JA021925 electric field; Ionosphere; Inner radiation belt; Van Allen Probes; zebra stripes |
| 2015 |
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Time Domain Structures: what and where they are, what they do, and how they are made Time Domain Structures (TDS) (electrostatic or electromagnetic electron holes, solitary waves, double layers, etc.) are >=1 msec pulses having significant parallel (to the background magnetic field) electric fields. They are abundant through space and occur in packets of hundreds in the outer Van Allen radiation belts where they produce magnetic-field-aligned electron pitch angle distributions at energies up to a hundred keV. TDS can provide the seed electrons that are later accelerated to relativistic energies by whistlers ... Mozer, F.S.; Agapitov, O.V.; Artemyev, A.; Drake, J.F.; Krasnoselskikh, V.; Lejosne, S.; Vasko, I.; Published by: Geophysical Research Letters Published on: 04/2015 YEAR: 2015 DOI: 10.1002/2015GL063946 |
| 2014 |
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The mechanisms for accelerating electrons from thermal to relativistic energies in the terrestrial magnetosphere, on the sun, and in many astrophysical environments have never been verified. We present the first direct observation of two processes that, in a chain, cause this acceleration in Earth\textquoterights outer radiation belt. The two processes are parallel acceleration from electron-volt to kilovolt energies by parallel electric fields in time-domain structures (TDS), after which the parallel electron velocity becom ... Mozer, S.; Agapitov, O.; Krasnoselskikh, V.; Lejosne, S.; Reeves, D.; Roth, I.; Published by: Physical Review Letters Published on: 07/2014 YEAR: 2014 DOI: 10.1103/PhysRevLett.113.035001 |
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The mechanisms for accelerating electrons from thermal to relativistic energies in the terrestrial magnetosphere, on the sun, and in many astrophysical environments have never been verified. We present the first direct observation of two processes that, in a chain, cause this acceleration in Earth\textquoterights outer radiation belt. The two processes are parallel acceleration from electron-volt to kilovolt energies by parallel electric fields in time-domain structures (TDS), after which the parallel electron velocity becom ... Mozer, F.; Agapitov, O.; Krasnoselskikh, V.; Lejosne, S.; Reeves, G.; Roth, I.; Published by: Phys. Rev. Lett. Published on: 07/2014 YEAR: 2014 DOI: 10.1103/PhysRevLett.113.035001 |
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