Results 81 to 90 of about 10,736 (185)

Ligand‐Driven Optimization of Iron Oxide Nanoprobes for In Vivo MRI Enhancement at Ultra‐High Field

Small, Volume 22, Issue 16, 17 March 2026.
Ligand‐tailored iron oxide nanoparticles reveal how surface chemistry controls T2 relaxivity and in vivo performance in ultra‐high‐field MRI. Systematic variation of hydrophilicity and charge across five coatings modulated r2 by up to 333 mm−1 s−1, with chemical properties, rather than shell thickness, dictating magnetic dephasing and enabling reliable
Pelayo García‐Acevedo, María Luz Alonso‐Alonso, Sara Ortega‐Espina, Manuel Bañobre‐López, Yolanda Piñeiro, Ramón Iglesias‐Rey, José Rivas   +6 more
wiley   +1 more source

MICROWAVE EMISSION OF SOLAR FLARES: CORONAL MASS EJECTIONS AND SHOCK WAVES

Odessa Astronomical Publications, 2017
Coronal  mass  ejections  (CMEs)  mostly affect  the  geomagnetic  field.  These  structures  are  observed  and  studied  with  coronagraphic  images  thereforewe don’t see the corona in the plane of the sky and  the measurements  of  the  propagation ...
E. A. Isaeva, Yu. T. Tsap
doaj   +1 more source

The magnetic connectivity of coronal shocks from behind-the-limb flares to the visible solar surface during $\gamma$-ray events

, 2017
Context. The observation of >100 MeV {\gamma}-rays in the minutes to hours following solar flares suggests that high-energy particles interacting in the solar atmosphere can be stored and/or accelerated for long time periods.
Plotnikov, I., Rouillard, A. P., Share, G. H.   +2 more
core   +3 more sources

Strong Polar Ionospheric Electron Density Depletion Under Prolonged Northward IMF Bz Condition

Earth and Space Science, Volume 13, Issue 3, March 2026.
Abstract Previous studies have primarily focused on high‐latitude ionospheric‐thermospheric (I‐T) variabilities under southward interplanetary magnetic field (IMF) conditions, while rare studies have investigated the I‐T responses to due northward Bz (NBz), especially in the presence of strong IMF By conditions.
Tianyu Cao, Yifan Lu, Jing Liu, Shuhan Li   +3 more
wiley   +1 more source

Machine Learning‐Ready Data Sets for the Analysis and Nowcasting of Atmospheric Radiation at Aviation Altitudes

Space Weather, Volume 24, Issue 3, March 2026.
Abstract Nowcasting and forecasting of the radiation environment in the Earth's lower atmosphere are critical for the safety of aircraft and spacecraft crews and passengers. Currently, this problem is addressed by employing statistical and physics‐based models that take into account particle transport and precipitation.
V. M. Sadykov, Z. M. Watkins, D. Kempton, W. Jones, S. K. C, G. T. Goodwin, X. He, W. K. Tobiska, I. Kitiashvili, C. Mertens, S. Ranjan, D. G. Deardorff, R. Spaulding   +12 more
wiley   +1 more source

The Efficiency of Harmonic Emissions Excited by Energetic Electrons in Coronal Loops

The Astrophysical Journal
Magnetic reconnection is a key process that drives the energy release in solar flares. This process can occur at multiple locations along the coronal loop.
Mehdi Yousefzadeh, Alexey Kuznetsov, Yao Chen, Mahboub Hosseinpour   +3 more
doaj   +1 more source

Simultaneous observations of changes in coronal bright point emission at the 20 cm radio and He Lambda 10830 wavelengths [PDF]

Preliminary results of observations of solar coronal bright points acquired simultaneously from ground based observatories at the radio wavelength of 20 cm and in the He I wavelength 10830 line on September 8, 1985, are reported.
Habbal, Shadia R., Harvey, Karen L.
core   +1 more source

Solar flare electron acceleration: comparing theories and observations

, 2003
A popular scenario for electron acceleration in solar flares is transit-time damping of low-frequency MHD waves excited by reconnection and its outflows.
A.O. Benz, Benz, Benz, Benz, Brown, Brown, Bruggmann, Dennis, Fisk, Fletcher, Grechnev, Grigis, Güdel, Innes, Isliker, Khan, Kliem, Kuijpers, Lin, Messmer, Miller, Neupert, P. Saint-Hilaire, Paesold, Paesold, Parks, Pohjolainen, Priest, Saint-Hilaire, Shibata, Simnett, Stix, Vlahos, Yokoyama, Young, Zhang   +35 more
core   +2 more sources

Quantifying the Impacts of the May 2024 Geomagnetic Storm on Transatlantic Aviation: Rerouting, Delays, and Economic Losses

Space Weather, Volume 24, Issue 3, March 2026.
Abstract The May 2024 geomagnetic storm, one of the most intense events of Solar Cycle 25 to date, caused widespread disruptions in aviation operations, particularly for polar and high‐latitude routes. This study quantifies the operational and economic impacts of the storm on 12 selected transatlantic flights between North America and Europe.
Jie Li, Xiaojian Hu, Dabin Xue, Zhizhao Liu, Qing‐He Zhang, Xueshang Feng   +5 more
wiley   +1 more source

Emission Characteristics of Energetic Electrons with Crescent-shaped Velocity Distributions

The Astrophysical Journal
Solar flares release magnetic energy through reconnection, accelerating electrons into nonthermal velocity distributions, including crescent-shaped electron populations. These energetic electron distributions are crucial in driving instabilities that can
Mehdi Yousefzadeh
doaj   +1 more source