Results 41 to 50 of about 235 (149)

3-D reconstructions of the early-November 2004 CDAW geomagnetic storms: analysis of Ooty IPS speed and density data [PDF]

Annales Geophysicae, 2009
Interplanetary scintillation (IPS) remote-sensing observations provide a view of the solar wind covering a wide range of heliographic latitudes and heliocentric distances from the Sun between ~0.1 AU and 3.0 AU. Such observations are used to study the
M. M. Bisi, B. V. Jackson, J. M. Clover, P. K. Manoharan, M. Tokumaru, P. P. Hick, P. P. Hick, A. Buffington   +7 more
doaj   +1 more source

Modeling the Excitation, Propagation, and Damping of Quasiperiodic Fast Magnetosonic Waves in Realistic Coronal Active Region Magnetic Field Structures

The Astrophysical Journal
Quasiperiodic fast propagating (QFP) magnetosonic waves have been discovered in the solar corona in the extreme ultraviolet (EUV) since the launch of the Solar Dynamics Observatory (SDO) spacecraft more than a decade ago.
Leon Ofman, Tongjiang Wang, Xudong Sun, Meng Jin   +3 more
doaj   +1 more source

Solar Origins of August 26, 2018 Geomagnetic Storm: Responses of the Interplanetary Medium and Equatorial/Low‐Latitude Ionosphere to the Storm

Space Weather, 2021
This study investigates the solar origins of August 26, 2018 geomagnetic storm and the responses of the interplanetary medium and equatorial/low‐latitude ionosphere to it. We used a multiinstrument approach, with observations right from the solar surface
A. O. Akala, O. J. Oyedokun, P. O. Amaechi, K. G. Simi, A. Ogwala, O. A. Arowolo   +5 more
doaj   +1 more source

Inferring the Solar Wind Velocity in the Outer Corona Based on Multiview Observations of Small-scale Transients by STEREO/COR2

The Astrophysical Journal
Based on the Heliospheric Imager-1 images of the STEREO twin spacecraft, we established the CORrelation-Aided Reconstruction (CORAR) technique to locate and reconstruct the 3D structures of solar wind transients in interplanetary space.
Shaoyu Lyu, Yuming Wang, Xiaolei Li, Quanhao Zhang, Jiajia Liu   +4 more
doaj   +1 more source

Enigmatic Centi-SFU and mSFU Nonthermal Radio Transients Detected in the Middle Corona

The Astrophysical Journal
Decades of solar coronal observations have provided substantial evidence for accelerated particles in the corona. In most cases, the location of particle acceleration can be roughly identified by combining high spatial and temporal resolution data from ...
Surajit Mondal, Bin Chen, Sijie Yu, Xingyao Chen, Peijin Zhang, Dale Gary, Marin M. Anderson, Judd D. Bowman, Ruby Byrne, Morgan Catha, Sherry Chhabra, Larry D’Addario, Ivey Davis, Jayce Dowell, Gregg Hallinan, Charlie Harnach, Greg Hellbourg, Jack Hickish, Rick Hobbs, David Hodge, Mark Hodges, Yuping Huang, Andrea Isella, Daniel C. Jacobs, Ghislain Kemby, John T. Klinefelter, Matthew Kolopanis, Nikita Kosogorov, James Lamb, Casey Law, Nivedita Mahesh, Brian O’Donnell, Kathryn Plant, Corey Posner, Travis Powell, Vinand Prayag, Andres Rizo, Andrew Romero-Wolf, Jun Shi, Greg Taylor, Jordan Trim, Mike Virgin, Akshatha Vydula, Sandy Weinreb, Scott White, David Woody, Thomas Zentmeyer   +46 more
doaj   +1 more source

Magnetic Reconnection in the Heliospheric Current Sheet Embedded in an Interplanetary Coronal Mass Ejection Sheath

The Astrophysical Journal Letters
Solar wind conditions in the heliosphere are altered by solar wind transients such as shocks and interplanetary coronal mass ejections (ICMEs). The interactions of coherent solar wind structures such as the heliospheric current sheet (HCS) with the ...
Matti Ala-Lahti, Tuija I. Pulkkinen, Jonas Suni, Heli Hietala, Simon W. Good, Mojtaba Akhavan-Tafti, Minna Palmroth, Emilia K. J. Kilpua   +7 more
doaj   +1 more source

Coronal Mass Ejection–Induced Sub-Alfvénic Solar Wind: Key Insights from Parker Solar Probe

The Astrophysical Journal
Since its eighth encounter, starting on 2022 April 28, Parker Solar Probe has consistently sampled the elusive sub-Alfvénic solar wind during each perihelion pass, offering unprecedented insights into these critical regions of the solar atmosphere. Here,
Vamsee Krishna Jagarlamudi, Carlos R. Braga, Nour E. Raouafi, Angelos Vourlidas   +3 more
doaj   +1 more source

A Drag-force Analysis of Solar Wind White-light Tracers in the Inner Heliosphere

The Astrophysical Journal
We studied the propagation of blobs, which are a subset of density mesoscale structures observed in the solar corona. The detection of blobs in white-light data was performed during Solar Cycle 23.
Cynthia López-Portela, Mari Paz Miralles, Alejandro Lara   +2 more
doaj   +1 more source

Transient coronal extreme ultraviolet emission before and during the impulsive phase of a solar flare

The Astrophysical Journal, 1989
Transient coronal EUV emission, recorded in an emission line of Fe XI at 180.4 A, has been observed prior to and during the initial stages of a solar flare. This emission provides direct evidence of the interactions between the lower corona and the chromosphere during flare initiation.
openaire   +1 more source

Improved modelling of SEP event onset within the WSA–Enlil–SEPMOD framework

Journal of Space Weather and Space Climate
Multi-spacecraft observations of solar energetic particle (SEP) events not only enable a deeper understanding and development of particle acceleration and transport theories but also provide important constraints for model validation efforts.
Palmerio Erika, Luhmann Janet G., Mays M. Leila, Caplan Ronald M., Lario David, Richardson Ian G., Whitman Kathryn, Lee Christina O., Sánchez-Cano Beatriz, Wijsen Nicolas, Li Yan, Cardoso Carlota, Pinto Marco, Heyner Daniel, Schmid Daniel, Auster Hans-Ulrich, Fischer David   +16 more
doaj   +1 more source