Results 141 to 150 of about 1,126,087 (267)

Satellite‐Based Analysis of CO2 Emissions From Global Cities: Regional, Economic, and Demographic Attributes

AGU Advances, Volume 6, Issue 4, August 2025.
Abstract Cities play a crucial role in reducing global greenhouse gas emissions. While activity‐based (“bottom up”) emission estimates are widely used for global cities, they often lack independent verification. In this study, we use remotely‐sensed CO2 observations from the Orbiting Carbon Observatory‐3 (OCO‐3) to “top‐down” estimate CO2 emissions for
D. Y. Ahn, D. L. Goldberg, F. Liu, D. C. Anderson, T. Coombes, C. P. Loughner, M. Kiel, A. Chatterjee   +7 more
wiley   +1 more source

A Peculiar Feature of the First Ionization Potential Effect Before a Solar Flare Impulsive Phase Observed by MSS-1B, CHASE, and SDO

The Astrophysical Journal
The impulsive phase of solar flares is often accompanied by the depletion of the elements with low first ionization potential (FIP), whose abundance decreases from the coronal level to the photospheric level, and then recovers back to the coronal level ...
Man-Hei Ng, Xiaoping Zhang, P. F. Chen
doaj   +1 more source

In Situ Measurements of Sensible Heat Fluxes in a Tropical Cyclone

Geophysical Research Letters, Volume 52, Issue 13, 16 July 2025.
Abstract Sensible heat fluxes play a major role in the formation and dynamics of Tropical Cyclones (TC), however in situ measurements of these fluxes have been impeded by the challenging and extreme conditions associated with these events. We used two sonic anemometers elevated at fixed height above the mean ocean surface to measure sensible heat ...
M. Novomestsky, J. J. Voermans, A. V. Babanin   +2 more
wiley   +1 more source

Comparisons Between the Global Ionosphere Thermosphere Model and HIWIND Measurements

Journal of Geophysical Research: Space Physics, Volume 130, Issue 7, July 2025.
Abstract Neutral winds in the daytime middle thermosphere are difficult to measure. The High altitude Interferometer WIND Observation instrument made measurements of these winds from a balloon in the summers of 2011 and 2018 during both daytime and nighttime at high latitudes.
A. J. Ridley, A. Alhothali
wiley   +1 more source

Ensemble Model Using the Fokker–Planck Equation and Alfvénic Drift for Estimating Proton Flux in Solar Energetic Particle Events

Earth and Space Science, Volume 12, Issue 7, July 2025.
Abstract Observations of solar energetic particles (SEPs) accelerated at collisionless shocks driven by coronal mass ejections (CMEs) highlight the importance of understanding proton transport in velocity space. In this study, we present an ensemble model based on the one‐dimensional Fokker–Planck equation to estimate proton flux from CME‐driven shocks
Ji‐Hoon Ha, Jae‐Hyung Lee, JaeHun Kim, Sang Cheol Han, Wonhyeong Yi, Hyun‐Jun Nah   +5 more
wiley   +1 more source

Two Distinctly Different Characteristics of Flare-driven Coronal Rain Revealed from High-resolution Spectroscopic Imaging Observations with FISS/GST

The Astrophysical Journal
We report on a flare-driven coronal rain event observed along postflare loops during the decay phase of an X1.6-class solar flare. Although high-resolution studies of flare-driven coronal rain have been conducted, imaging spectroscopic studies are rare ...
Donguk Song, Eun-Kyung Lim, Jongchul Chae, Maria S. Madjarska, Masahito Kubo, Hannah Kwak, Juhyung Kang, Ryohtaroh T. Ishikawa, Kyoung-Sun Lee   +8 more
doaj   +1 more source

Solar Flare 1/f Fluctuations from Amplitude-Modulated Five-Minute Oscillation. [PDF]

Entropy (Basel), 2023
Morikawa M, Nakamichi A.
europepmc   +1 more source

Imprints of Intense Geomagnetic Storm on Very Low Frequency (VLF) Radio Waves Over the Mediterranean Region

Journal of Geophysical Research: Space Physics, Volume 130, Issue 7, July 2025.
Abstract The study of solar and geomagnetic activity effects on the D‐region ionosphere (60–90 km altitude) using signals from very low frequency and low frequency (VLF, 3–30 kHz) transmitters has garnered considerable attention over the past decades. This research investigates the impacts of the geomagnetic storm (GMS) of 23–24 March 2023, utilizing ...
Muyiwa P. Ajakaiye, Ben Romano, Yuval Reuveni   +2 more
wiley   +1 more source

Observations of Geomagnetic Crochet at High‐Latitudes Due To X1.5 Class Solar Flare on 3 July 2021

Space Weather
On 3 July 2021, an X1.5 solar flare from the National Oceanic and Atmospheric Administration solar Active Region AR12838 (24°N, 88°W) occurred at 14:18 UT, peaked at 14:29 UT, and decayed at 14:34 UT. The study of this X1.5 solar flare is significant due
S. S. Rao, Nandita Srivastava, Monti Chakraborty, Sandeep Kumar, D. Chakrabarty   +4 more
doaj   +1 more source

Observation of a Solar Flare at 4.3-mm. Wave-length [PDF]

, 1958
R. J. Coates
openalex   +1 more source