Results 71 to 80 of about 2,470 (205)

Source and Propagation of a Streamer Blowout Coronal Mass Ejection Observed by the Parker Solar Probe

The Astrophysical Journal Supplement Series, 2020
Abstract In the first orbit of the Parker Solar Probe (PSP), in situ thermal plasma and magnetic field measurements were collected as close as 35 R Sun from the Sun, an environment that had not been previously explored.
Korreck, Kelly, Szabo, Adam, Chinchilla, Teresa Nieves, Lavraud, Benoit, Luhmann, Janet, Niembro, Tatiana, Higginson, Aleida, Alzate, Nathalia, Wallace, Samantha, Paulson, Kristoff, Rouillard, Alexis, Kouloumvakos, Athanasios, Poirier, Nicolas, Kasper, Justin, Case, A., Stevens, Michael, Bale, Stuart, Pulupa, Marc, Whittlesey, Phyllis, Livi, Roberto, Goetz, Keith, Larson, Davin, Malaspina, David, Morgan, Huw, Narock, Ayris, Schwadron, Nathan, Bonnell, John, Harvey, Peter, Wygant, John   +28 more
openaire   +2 more sources

Slow Solar Wind: Origin in an Independent Small‐Scale Solar Dynamo

Geophysical Research Letters, Volume 52, Issue 13, 16 July 2025.
Abstract Separation of the solar wind (SW) into three flow types (coronal mass ejections (CMEs), high speed streams (HSSs), and slow solar wind (SSW)) reveals an inverse relationship between the percentage of time Earth spends in SSW during a year and its annually averaged magnetic field strength (B).
E. W. Cliver, I. G. Richardson, S. F. Martin   +2 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

Solar wind minor ions: Recent observations [PDF]

, 1982
Systematic studies show that the minor ions generally travel with a common bulk speed and have temperatures roughly proportional to their masses. It was determined that (3)He(++) content varies greatly; (3)He(++)/(4)He(++) ranges from as high as 10(-12 ...
Bame, S. J.
core   +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

Predicting Geomagnetic Activity Cycles

Space Weather, Volume 23, Issue 5, May 2025.
Abstract The vast majority of solar cycle predictions focus on predicting the 11‐year sunspot cycle, while space weather and geomagnetic activity predictions are largely made for short time scales, from hours up to a month. Here, we aim to predict geomagnetic activity in the solar cycle time scale. We use a 180‐year composite of the geomagnetic aa $aa$
Timo Qvick, Timo Asikainen, Kalevi Mursula   +2 more
wiley   +1 more source

Investigating the Behavior and Spatiotemporal Variations of Green-line Emission in the Solar Corona

The Astrophysical Journal Supplement Series
Understanding coronal structure and dynamics can be facilitated by analyzing green-line emission, which enables the investigation of diverse coronal structures such as coronal loops, streamers, coronal holes, and various eruptions in the solar atmosphere.
Jacob Oloketuyi, Yu Liu, Linhua Deng, Abouazza Elmhamdi, Fengrong Zhu, Ayodeji Ibitoye, Opeyemi Omole, Feiyang Sha, Qiang Liu   +8 more
doaj   +1 more source

Observational features of equatorial coronal hole jets

, 2010
Collimated ejections of plasma called "coronal hole jets" are commonly observed in polar coronal holes. However, such coronal jets are not only a specific features of polar coronal holes but they can also be found in coronal holes appearing at lower ...
Bothmer, V., Nistico', G., Patsourakos, S., Zimbardo, G.   +3 more
core   +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

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