Results 71 to 80 of about 41,638 (224)

Multiscale statistical analysis of coronal solar activity

, 2016
Multi-filter images from the solar corona are used to obtain temperature maps which are analyzed using techniques based on proper orthogonal decomposition (POD) in order to extract dynamical and structural information at various scales.
del-Castillo-Negrete, Diego, Gamborino, Diana, Martinell, Julio J.   +2 more
core   +2 more sources

Reduced cardiovascular mortality at moderate altitude: a putative role of physical activity and body mass

The Journal of Physiology, EarlyView.
Abstract figure legend Benefits of performing physical exercise at moderate altitude. At moderate altitude, increased resting metabolic rate and physical exertion promote physical fitness and exercise tolerance, whereas hypoxia suppresses appetite and elicits adaptations that increase tissue O2 delivery while augmenting O2‐independent ATP production ...
Robert T. Mallet, Johannes Burtscher, Hannes Gatterer, Katharina Hüfner, Samuel Verges, Tadej Debevec, Martin Burtscher   +6 more
wiley   +1 more source

X‐ray spectral observations of a solar active region corona [PDF]

Geophysical Research Letters, 1997
We study the X‐ray flux and electron temperature variation of the corona above a solar active region. Electron temperatures are determined using data from the S xv channel of the Bragg crystal spectrometer (BCS) instrument on board the Yohkoh satellite.
openaire   +1 more source

Why Do Solar Wind Models Get It Wrong? Understanding the Capabilities of Time-dependent Solar Wind Simulations

The Astrophysical Journal
We explore the capabilities of time-dependent (TD) magnetohydrodynamic (MHD) solar wind simulations with the coupled Wang–Sheeley–Arge (WSA) model of the solar corona and the Grid Agnostic MHD for Extended Research Applications model of the inner ...
Evangelia Samara, Elena Provornikova, C. Nick Arge, Andrew J. McCubbin, Viacheslav G. Merkin   +4 more
doaj   +1 more source

Exploring the Origin of Solar Energetic Electrons. I. Constraining the Properties of the Acceleration Region Plasma Environment

The Astrophysical Journal, 2023
Solar flare electron acceleration is an efficient process, but its properties (mechanism, location) are not well constrained. Via hard X-ray (HXR) emission, we routinely observe energetic electrons at the Sun, and sometimes we detect energetic electrons ...
Ross Pallister, Natasha L. S. Jeffrey
doaj   +1 more source

Fifteen years in the high-energy life of the solar-type star HD 81809. XMM-Newton observations of a stellar activity cycle [PDF]

, 2017
Aims. The data set of the long-term XMM-Newton monitoring program of HD 81809 is analyzed to study its X-ray cycle, to investigate if the latter is related to the chromospheric one, to infer the structure of the corona of HD 81809, and to explore if the ...
Favata, F., Maggio, A., Micela, G., Mittag, M., Orlando, S., Robrade, J., Schmitt, J. H. M. M., Sciortino, S.   +7 more
core   +2 more sources

Machine Learning for Local Detection of Separators in Three‐Dimensional Magnetic Fields

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 3, June 2026.
Abstract Magnetic reconnection is a major plasma phenomenon occurring in various key environments ranging from the Sun and near‐Earth space to astrophysical plasmas. While magnetic reconnection is relatively well‐understood under two‐dimensional (2D) settings, it remains challenging to characterize in three‐dimensional (3D) magnetic fields.
Fanni Franssila, Markku Alho, Ioanna Bouri, Daniel Holmberg, Minna Palmroth, Teemu Roos   +5 more
wiley   +1 more source

Nonlinear force-free models for the solar corona [PDF]

Astronomy & Astrophysics, 2007
11 pages, 11 ...
Regnier, S., Priest, E. R.
openaire   +2 more sources

HELIOS: A Visualization Tool to Decipher the Locations and Dynamical Properties of Expanding Small Magnetic Flux Ropes in the Corona

The Astrophysical Journal Supplement Series
On 2024 December 24, Parker Solar Probe made its closest approach to the Sun, reaching a 9.86 R _⊙ heliocentric distance and capturing high-resolution observations of the solar corona.
Evangelos Paouris, Angelos Vourlidas, Guillermo Stenborg   +2 more
doaj   +1 more source

Observations of the 2019 April 4 Solar Energetic Particle Event at the Parker Solar Probe [PDF]

, 2019
A solar energetic particle event was detected by the Integrated Science Investigation of the Sun (IS⊙IS) instrument suite on Parker Solar Probe (PSP) on 2019 April 4 when the spacecraft was inside of 0.17 au and less than 1 day before its second ...
Allen, R. C., Bale, S. D., Case, A. W., Christian, E. R., Cohen, C. M. S., Cummings, A. C., Davis, A. J., Desai, M. I., Giacalone, J., Hill, M. E., Joyce, C. J., Kasper, J. C., Korreck, K. E., Krimigis, S. M., Labrador, A. W., Leske, R. A., Livi, R., MacDowall, R. J., Malandraki, O., Matthaeus, W. H., McComas, D. J., McNutt, R. L., Jr., Mewaldt, R. A., Mitchell, D. G., Poduval, B., Posner, A., Pulupa, M., Rankin, J. S., Roelof, E. C., Schwadron, N. A., Stevens, M. L., Stone, E. C., Szalay, J. R., Vourlidas, A., Whittlesey, P., Wiedenbeck, M. E.   +35 more
core   +3 more sources