Results 61 to 70 of about 987 (189)

Interplanetary Electric Fields for Extreme Magnetic Storms

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract Using a list of sudden‐commencement storms, the ring‐current index, and 1‐h near‐Earth solar‐wind measurements from solar cycles 20–25, we develop extreme‐value statistical models relating storm intensity D=max{−Dst} $D=\max \left\{-Dst\right\}$ to the storm main‐phase maximum duskward interplanetary electric field E $E$.
Jeffrey J. Love, E. Joshua Rigler, Ian G. Richardson, Kalevi Mursula   +3 more
wiley   +1 more source

The Short and Long Timescale Responses of the Inner Magnetospheric EMIC Waves to the Solar Wind Dynamic Pressure

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract The causal relationships between solar wind dynamic pressure and Electromagnetic Ion‐Cyclotron (EMIC) H+ ${\mathrm{H}}^{+}$, He+ ${\mathrm{H}\mathrm{e}}^{+}$, O+ ${\mathrm{O}}^{+}$ waves at L=3−6 $L=3-6$ are investigated with transfer entropy at short (<15 ${< } 15$ min) and long (>45 ${ >} 45$ min) timescales. The short timescale responses of
Simon Wing, Jay R. Johnson, Anthony Saikin, Alexander Y. Drozdov, Derek Feitosa   +4 more
wiley   +1 more source

Simultaneous TRACERS and THEMIS Observations of Reversed Cusp Ion Dispersions and Dual‐Lobe Reconnection

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract We present observations from two consecutive TRACERS‐2 orbits through the northern low‐altitude cusp. During the first crossing, TRACERS‐2 observed reversed cusp ion dispersion and sunward convection, consistent with magnetopause reconnection tailward of the cusp during this northward IMF interval.
M. Øieroset, S. A. Fuselier, J. B. Bonnell, R. A. Roglans, J. S. Halekas, R. J. Strangeway, T. D. Phan, R. G. Gomez, S. M. Petrinec, K. J. Trattner, S. R. Shaver, K. A. Goodrich, S. A. Henderson, S. L. Soni, V. Angelopoulos, B. L. Burkholder, H. Cao, L.‐J. Chen, H. K. Connor, D. M. Miles, A. Moore, J. Ng, Y. Shen   +22 more
wiley   +1 more source

A Novel Method to Train Classification Models for Structure Detection in In Situ Spacecraft Data

Earth and Space Science
We present a method for creating spacecraft‐like data which can be used to train Machine Learning (ML) models to detect and classify structures in in situ spacecraft data.
K. Bergstedt, H. Ji
doaj   +1 more source

A comparative study of dipolarization fronts at MMS and Cluster

Geophysical Research Letters, 2016
We present a statistical study of dipolarization fronts (DFs), using magnetic field data from MMS and Cluster, at radial distances below 12 RE and 20 RE, respectively.
D. Schmid, R. Nakamura, M. Volwerk, F. Plaschke, Y. Narita, W. Baumjohann, W. Magnes, D. Fischer, H. U. Eichelberger, R. B. Torbert, C. T. Russell, R. J. Strangeway, H. K. Leinweber, G. Le, K. R. Bromund, B. J. Anderson, J. A. Slavin, E. L. Kepko   +17 more
doaj   +1 more source

Electromagnetic Ion Cyclotron Waves in the Initial Phase of Geomagnetic Storms

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract Using simultaneous magnetic field observations from 10 satellites and an automated detection algorithm, we identify broad regions of electromagnetic ion cyclotron (EMIC) wave activity during the initial phases of geomagnetic storms between September 2015 and October 2019.
Taylor R. Whitney Aegerter, Lauren W. Blum   +1 more
wiley   +1 more source

Energy limits of electron acceleration in the plasma sheet during substorms: A case study with the Magnetospheric Multiscale (MMS) mission

Geophysical Research Letters, 2016
We present multipoint observations of earthward moving dipolarization fronts and energetic particle injections from NASA's Magnetospheric Multiscale mission with a focus on electron acceleration.
D. L. Turner, J. F. Fennell, J. B. Blake, J. H. Clemmons, B. H. Mauk, I. J. Cohen, A. N. Jaynes, J. V. Craft, Victoria Wilder, D. N. Baker, G. D. Reeves, D. J. Gershman, L. A. Avanov, J. C. Dorelli, B. L. Giles, C. J. Pollock, D. Schmid, R. Nakamura, R. J. Strangeway, C. T. Russell, A. V. Artemyev, A. Runov, V. Angelopoulos, H. E. Spence, R. B. Torbert, J. L. Burch   +25 more
doaj   +1 more source

Is the Magnetic Field Line Curvature Really Important for Energetic Electron Losses From the Radiation Belt?

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract Recently, Hua et al. (2026, https://doi.org/10.1029/2025GL120881) combined observations during a 4‐day storm period with numerical simulations and concluded that the abrupt electron loss in the field‐line‐curvature scattering (FLCS) region played a leading role in shaping the outer boundary of radiation belt (RB); the authors conjectured that ...
V. A. Sergeev, N. A. Tsyganenko
wiley   +1 more source

Collisionless reconnection in Jupiter's magnetotail

Geophysical Research Letters, 1991
We present the first quantitative study of collisionless reconnection in Jupiter's magnetotail. Recently it has been shown that collisionless reconnection can occur in the Earth's magnetotail quasi‐neutral sheet when the electrons are subject to chaotic pitch angle diffusion.
openaire   +2 more sources

Magnetotail flux ropes

Geophysical Research Letters, 1984
ISEE‐3 magnetometer observations are presented that are consistant with flux ropes within the magnetotail. Three instances have been found. The flux ropes are identified by a strong magnetic field in their core, a bipolar magnetic field signature, and a double peaked field signature indicative of an off‐center crossing.
D. G. Sibeck, G. L. Siscoe, J. A. Slavin, E. J. Smith, S. J. Bame, F. L. Scarf   +5 more
openaire   +1 more source