C. M. Cully

University of Calgary

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V. Angelopoulos

Planetary Science Institute

O. Le Contel

Laboratoire de Physique des Plasmas

R. E. Ergun

Laboratory for Atmospheric and Space Physics

J. W. Bonnell

University of California, Berkeley

E. Donovan

University of Calgary

A. Roux

Institut National des Langues et Civilisations Orientales

Y. V. Khotyaintsev

Swedish Institute of Space Physics

M. André

Swedish Institute of Space Physics

J. P. McFadden

University of California, Berkeley

U. Auster

Technische Universität Braunschweig

Cooperative Institutions

Centre National de la Recherche Scientifique

156

University of California, Berkeley

122

Goddard Space Flight Center

106

University of Colorado Boulder

Charles River Laboratories (Netherlands)

Laboratory for Atmospheric and Space Physics

Swedish Institute of Space Physics

Sorbonne Université

University of California, Los Angeles

John Wiley & Sons (United States)

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An Observation Linking the Origin of Plasmaspheric Hiss to Discrete Chorus Emissions

Science (2009)

Jacob Bortnik Wen Li R. M. Thorne V. Angelopoulos C. M. Cully

A long-standing problem in the field of space physics has been the origin of plasmaspheric hiss, a naturally occurring electromagnetic wave in the high-density plasmasphere (roughly within 20,000 kilometers of Earth) that is known to remove the high-energy Van Allen Belt electrons that pose a threat to satellites and astronauts. A recent theory tied the origin of plasmaspheric hiss to a seemingly different wave in the outer magnetosphere, but this theory was difficult to test because of a challenging set of observational requirements. Here we report on the experimental verification of the theory, made with a five-satellite NASA mission. This confirmation will allow modeling of plasmaspheric hiss and its effects on the high-energy radiation environment.

Hiss

Plasmasphere

Van Allen Probes

Chorus

10.1126/science.1171273

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Citations (187)

Themis observations of whistler wave normal angles

HAL (Le Centre pour la Communication Scientifique Directe) (2014)

U. Taubenschuss Y. V. Khotyaintsev A. Vaivads O. Santolı́k C. M. Cully

Whistler

Source

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Citations (0)

Estimation of magnetic field mapping accuracy using the pulsating aurora-chorus connection

Geophysical Research Letters (2011)

Y. Nishimura Jacob Bortnik Wen Li R. M. Thorne L. R. Lyons

[1] Although magnetic field models are widely used in magnetosphere-ionosphere coupling studies to perform field-line mapping, their accuracy has been difficult to estimate experimentally. Taking advantage of the high correlation between lower-band chorus and pulsating aurora, we located the THEMIS spacecraft footprint within ∼km accuracy and calculated the differences from mappings given in widely-used Tsyganenko models. Using 13 conjunctions of the THEMIS spacecraft and ground-based imagers, we found that the Tsyganenko model footprints were located within 1°–2° magnetic latitude and 0.1–0.2 h magnetic local time of our derived footprint. The deviation between the footprints has a consistent dependence on geomagnetic activity. Our results showed that the real magnetic field tends to be less stretched than that in the Tsyganenko models during quiet times and comparable to or more stretched during disturbed times. This approach can be used to advance modeling of field lines that connect to the near-Earth plasma sheet.

Field line

Footprint

QUIET

Chorus

Line (geometry)

10.1029/2011gl048281

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Citations (33)

Electric fields and current sheet structure in magnetospheric plasmas

PhDT (2007)

C. M. Cully

Plasma sheet

Current sheet

Electric current

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Citations (2)

Observation of chorus in near-Earth flux pileup region

AGU Fall Meeting Abstracts (2012)

Hong Fu C. M. Cully Y. V. Khotyaintsev A. Vaivads M.-O. André

Chorus

Source

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Citations (0)

Relation between electromagnetic waves and FTE's

AGU Fall Meeting Abstracts (2007)

P. Robert A. Roux O. Le Contel Christophe Coillot A. Bouabdellah

Source

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Quantifying Energetic Particle Precipitation using the Array for Broadband Observations of VLF/ELF Emissions (ABOVE)

AGUFM (2015)

C. M. Cully

Hiss

Particle (ecology)

Source

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Characteristics of whistler-mode wave Poynting vector observed on THEMIS

AGU Fall Meeting Abstracts (2012)

W. Li R. M. Thorne Jacob Bortnik V. Angelopoulos T. Nishimura

Whistler

Mode (computer interface)

Source

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Conjugate Observation of Magnetospheric Chorus Propagating to the Ionosphere by Ducting

Geophysical Research Letters (2021)

Yangyang Shen Lunjin Chen X.‐J. Zhang A. V. Artemyev V. Angelopoulos

Abstract Whistler‐mode chorus waves are critical for driving resonant scattering and loss of radiation belt relativistic electrons into the atmosphere. The resonant energies of electrons scattered by chorus waves increase at increasingly higher magnetic latitudes. Propagation of chorus waves to middle and high latitudes is hampered by wave divergence and Landau damping but is promoted otherwise if ducted by density irregularities. Although ducting theories have been proposed since the 1960s, no conjugate observation of ducted chorus propagation from the equatorial magnetosphere to the ionosphere has been observed so far. Here we provide such an observation, for the first time, using conjugate spacecraft measurements. Ducted chorus waves maintain significant wave power upon reaching the ionosphere, which is confirmed by ray‐tracing simulations. Our results suggest that ducted chorus waves may be an important driver for relativistic electron precipitation.

Chorus

Atmospheric duct

Electron precipitation

Whistler

10.1029/2021gl095933

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Citations (14)

Simulation of Potential Measurements Around a Photoemitting Spacecraft in a Flowing Plasma

IEEE Transactions on Plasma Science (2012)

Alexander Sjogren A. I. Eriksson C. M. Cully

Plasma measurements by electrostatic probes are influenced by the spacecraft-plasma interaction, including the photoelectrons emitted by the spacecraft. Such effects get particularly important in tenuous plasmas with large Debye lengths. We have used the particle-in-cell code package SPIS to study the close environment of the Rosetta spacecraft, and the impact of the spacecraft-plasma interaction on the electrostatic potential at the position of the Langmuir probes onboard. The simulations show that in the solar wind, photoemission has a bigger impact than wake formation. Spacecraft potential estimates based on Langmuir probe data in the solar wind need to be compensated for these effects when the spacecraft attitude varies. The SPIS simulations are validated by comparison to an independent code.

Spacecraft charging

Langmuir Probe

Astrophysical plasma

Particle-in-cell

10.1109/tps.2012.2186616

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Citations (14)