Results 71 to 80 of about 205 (182)

Spectral Analysis of Solar Radio Type III Bursts from 20 kHz to 410 MHz

The Astrophysical Journal, 2022
We present the statistical analysis of the spectral response of solar radio type III bursts over the wide frequency range between 20 kHz and 410 MHz. For this purpose, we have used observations that were carried out using both spaced-based (Wind/Waves ...
K. Sasikumar Raja, Milan Maksimovic, Eduard P. Kontar, Xavier Bonnin, Philippe Zarka, Laurent Lamy, Hamish Reid, Nicole Vilmer, Alain Lecacheux, Vratislav Krupar, Baptiste Cecconi, Lahmiti Nora, Laurent Denis   +12 more
doaj   +1 more source

THE NON-RADIAL PROPAGATION OF CORONAL STREAMERS WITHIN A SOLAR CYCLE

The Astrophysical Journal, 2010
We have analyzed the shape of the solar corona using the data of daily observations with Mark-III/IV (1980-2008) and SOHO/LASCO-2 (1996-2009) telescopes. The angles of deviation of coronal rays from the radial direction Δθ vary cyclically, reaching the maximum deviation toward the solar equator at the minimum of the solar activity.
openaire   +1 more source

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

Measurements of the Perpendicular Correlation Length of Coronal Alfvénic Waves with DKIST

The Astrophysical Journal
We have measured the perpendicular correlation length L _⊥ of Alfvénic waves in the corona using data from the Daniel K. Inouye Solar Telescope (DKIST) Cryogenic Near Infrared Spectropolarimeter (Cryo-NIRSP) instrument.
Michael Hahn, Stefan J. Hofmeister, Alexandros Koukras, Daniel Wolf Savin   +3 more
doaj   +1 more source

Empirical Functions for Highly Charged Ion Abundances in Solar Wind Charge Exchange Models: Addressing Post‐2011 ACE Data Limitations

Geophysical Research Letters, Volume 52, Issue 8, 28 April 2025.
Abstract Upcoming imaging missions—NASA's LEXI and ESA/CAS's SMILE—will target solar wind charge exchange X‐ray (SWCX) emission from Earth's magnetosheath. This emission is generated by highly charged ions colliding with neutrals in Earth's exosphere.
D. Koutroumpa, K. D. Kuntz, J. A. Carter, J. Raines, S. T. Lepri, L. Zhao   +5 more
wiley   +1 more source

Application of a Low-dissipation HLLD Approximate Riemann Solver to Solar Wind Simulations

The Astrophysical Journal
We investigate the steady-state solar wind in spherical coordinates using a low-dissipation Harten–Lax–van Leer-Discontinuities Riemann solver, in which the magnetic field is decomposed into an initial potential field B _0 and a time-dependent part B _1 .
Caixia Li, Zhenning Shen, Man Zhang, Xueshang Feng   +3 more
doaj   +1 more source

Asymmetry in the Ring Current During Geomagnetic Disturbances

Journal of Geophysical Research: Space Physics, Volume 130, Issue 3, March 2025.
Abstract Geomagnetic disturbances (GMDs) are defined as rapid changes in the magnetic field of the Earth that can lead to geomagnetically induced currents (GICs). Recent studies have shown that there are two main populations of GMDs, one in the pre‐midnight sector and one in the dawn sector.
G. E. Bower, S. E. Milan, S. Imber, A. Schillings, A. Fleetham, C. Beggan, J. W. Gjerloev   +6 more
wiley   +1 more source

Auroral Energy Deposition and Conductance During the 2013 St. Patrick's Day Storm: Meso‐Scale Contributions

Journal of Geophysical Research: Space Physics, Volume 130, Issue 2, February 2025.
Abstract Geomagnetic storms transfer massive amounts of energy from the sun to geospace. Some of that energy is dissipated in the ionosphere as energetic particles precipitate and transfer their energy to the atmosphere, creating the aurora. We used the Time History of Events and Macroscale Interactions during Substorms (THEMIS) mosaic of all‐sky ...
Christine Gabrielse, Y. Nishimura, J. H. Hecht, M. W. Chen, S. R. Kaeppler, D. M. Gillies, Y. Deng, E. Spanswick, E. Donovan, J. S. Evans, L. R. Lyons   +10 more
wiley   +1 more source

Spectroscopic Observations of the Solar Corona during the 2017 August 21 Total Solar Eclipse: Comparison of Spectral Line Widths and Doppler Shifts between Open and Closed Magnetic Structures

The Astrophysical Journal
The spectroscopic observations presented here were acquired during the 2017 August 21 total solar eclipse (TSE) with a three-channel partially multiplexed imaging spectrometer operating at extremely high orders (>50). The 4 R _⊙ extent of the slit in the
Yingjie Zhu, Shadia R. Habbal, Adalbert Ding, Bryan Yamashiro, Enrico Landi, Benjamin Boe, Sage Constantinou, Michael Nassir   +7 more
doaj   +1 more source

Observations of Localized Horizontal Geomagnetic Field Variations Associated With a Magnetospheric Fast Flow Burst During a Magnetotail Reconnection Event Detected by the THEMIS Spacecraft

Journal of Geophysical Research: Space Physics, Volume 130, Issue 1, January 2025.
Abstract On 20 December 2015, three Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft detected a nightside magnetotail reconnection event in the early main phase of a major geomagnetic storm. The spacecraft (P5, P4, and P3) had their footprints located over North America near the Gillam ground magnetometer station ...
Chigomezyo M. Ngwira, Yukitoshi Nishimura, James M. Weygand, Mark J. Engebretson, Antti Pulkkinnen, Peter W. Schuck   +5 more
wiley   +1 more source