Results 41 to 50 of about 8,815 (178)

Extended Scenarios for Solar Radio Emissions With Downshifted Electron Beam Plasma Excitations

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract First‐principle studies of radiative processes aimed at explaining the origin of type II and type III solar radio bursts raise questions on the implications of downshifted electron beam plasma excitations with frequency (slightly) below the plasma frequency ω≲ωpe $\left(\omega \lesssim {\omega }_{pe}\right)$ in the generation of radio ...
M. Lazar, R. A. López, S. M. Shaaban, S. Poedts, H. Fichtner   +4 more
wiley   +1 more source

Third-moment descriptions of the interplanetary turbulent cascade, intermittency and back transfer [PDF]

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2015
We review some aspects of solar wind turbulence with an emphasis on the ability of the turbulence to account for the observed heating of the solar wind. Particular attention is paid to the use of structure functions in computing energy cascade rates and their general agreement with the measured thermal proton heating.
Julia E. Stawarz, Miriam A. Forman, Bernard J. Vasquez, Charles W. Smith, Jesse T. Coburn   +4 more
openaire   +3 more sources

Statistical Study of Magnetic Overshoots at Collisionless Shocks

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract We use data from the Magnetospheric Multiscale, Solar Orbiter, and Cassini spacecraft to statistically study magnetic overshoots at Earth's bow shock, interplanetary shocks, and Saturn's bow shock. The size of the magnetic overshoot exhibits a clear positive correlation with the Alfvénic Mach number and its dependence on the upstream plasma ...
M. Lindberg, H. Hietala, K. Shirazul, D. Trotta, A. H. Sulaiman, B. L. Burkholder, A. Dimmock   +6 more
wiley   +1 more source

Ground Magnetic Response to an Extraordinary IMF BY Flip During the May 2024 Storm: Travel Time From the Magnetosheath to Dayside High Latitudes

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract In the present study we investigate the response of the dayside ground magnetic field to the sequence of interplanetary magnetic field (IMF) BY changes during the May 2024 geomagnetic storm. We pay particular attention to its extraordinarily large (>120 nT) and abrupt flip, and use GOES‐18 (G18) magnetic field measurements in the dayside ...
S. Ohtani, Y. Zou, V. G. Merkin, M. Wiltberger, K. H. Pham, S. Raptis, M. Friel, J. W. Gjerloev   +7 more
wiley   +1 more source

Solar and Interplanetary Turbulence: Lagrangian Coherent Structures

, 2020
<p>The dynamics of solar and interplanetary plasmas is governed by coherent structures such as current sheets and magnetic flux ropes which are responsible for the genesis of intermittent turbulence via magnetic reconnections in solar supergranular junctions, solar coronal loops, the shock-sheath region of an interplanetary ...
Abraham C.‐L. Chian, L. R. Bellot Rubio, H. Q. Feng, Tiago F. P. Gomes, Milan Gošić, D. Grasso, Qiang Hu, K. Kusano, Rodrigo A. Miranda, Pablo R. Muñoz, Erico L. Rempel, D. Ruffolo, Suzana S. A. Silva, Dazhong Wu   +13 more
openaire   +3 more sources

Studying the Inner Heliosphere Using Radio Signals Transmitted From Spacecraft Orbiting Mars

Space Weather, Volume 23, Issue 5, May 2025.
Abstract In this campaign, we used very long baseline interferometry (VLBI) radio telescopes to track the carrier radio signal transmitted from spacecraft orbiting Mars during the Mars solar conjunction. The campaign extended from September 6th $6\text{th}$ to November 6th $6\text{th}$ 2021 and targeted the Mars Express (MEX) and Tianwen‐1 (TIW ...
J. Edwards, G. Molera Calvés, P. Kummamuru, N. M. M. Said, M. Ma   +4 more
wiley   +1 more source

Imbalanced Regression Artificial Neural Network Model for Auroral Electrojet Indices (IRANNA): Can We Predict Strong Events?

Space Weather, Volume 23, Issue 5, May 2025.
Abstract We develop an Imbalanced Regression Artificial Neural Network model for the Auroral electrojet index (IRANNA) to predict the SuperMAG SML index, addressing the heavily imbalanced distribution of the SML data set. The data set contains mostly quiet‐time values of lesser importance and very few strong‐to‐extreme values of interest, such as those
Xiangning Chu, Lucas Jia, Robert L. McPherron, Xinlin Li, Jacob Bortnik   +4 more
wiley   +1 more source

Effect of interplanetary shock waves on turbulence parameters

Abstract. We have performed an extensive statistical investigation of how interplanetary fast forward shocks affect certain turbulence parameters – namely, the normalised cross-helicity (𝜎𝑐), residual energy (𝜎𝑟) and magnetic helicity (𝜎𝑚). A total of 371 shocks detected by Wind at 1 au and seven shocks by Solar Orbiter below 0.5 au have been analysed.
Emilia Kilpua, Simon Good, Juska Soljento, Domenico Trotta, Tia Bäcker, Julia Ruohotie, Jens Pomoell, Chaitanya Sishtla, Rami Vainio   +8 more
openaire   +3 more sources

Solar cycle changes of large-scale solar wind structure

, 2011
In this paper, I present the results on large-scale evolution of density turbulence of solar wind in the inner heliosphere during 1985 - 2009. At a given distance from the Sun, the density turbulence is maximum around the maximum phase of the solar cycle
Manoharan, P. K. Manoharan
core   +1 more source

Core‐Halo Correlations of Solar Wind Electrons and Temperature Anisotropy Instabilities

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract The properties of electrons in the heliospheric plasma are modulated by various factors, starting with the expansion and bimodal nature of the slow or fast solar wind, and continuing with the kinetic mechanisms of acceleration and energy exchange with small‐scale plasma waves.
S. M. Shaaban, S. Kennis, M. Lazar, V. Pierrard, S. Poedts   +4 more
wiley   +1 more source