Results 71 to 80 of about 16,769 (212)

A Contemporary View of Coronal Heating [PDF]

, 2012
Determining the heating mechanism (or mechanisms) that causes the outer atmosphere of the Sun, and many other stars, to reach temperatures orders of magnitude higher than their surface temperatures has long been a key problem. For decades the problem has
Aschwanden M. J., Biermann L., De Moortel I., Edlén B., Galsgaard K., Galsgaard K., Heyvaerts J., Klimchuk J. A., Parnell C. E., Petschek H. E., Ruderman M. S., Ruderman M. S., Shibata K., Shibata K., Shimizu T., Vaiana G. S.   +15 more
core   +1 more source

Parker Solar Probe Observations of Proton Core‐Beam Distributions in Heliospheric Current Sheet Region: Quasilinear Instability Analysis Combined With Collisional Relaxation

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract Parker Solar Probe has been proven as instrumental for the observation of young solar wind. During the encounters E‐07 and E‐08, PSP recorded the core plus beaming protons crossing the heliospheric current Sheet region. When the observed PSP data is plotted in the temperature ratio versus parallel beta space, it is found that the occurrence ...
M. Rashid, P. H. Yoon, J. Huang, C. Salem, M. Sarfraz, S. Alnussirat, R. A. López, J. Seough, H. Xie, D. Larson, R. Livi   +10 more
wiley   +1 more source

Coronal Heating from Alfvén Wave Turbulence in Solar Coronal Loops

, 2020
This work is supported by the NSF-REU Solar Physics program at SAO, grant number AGS-1850750.
openaire   +1 more source

Joule Heating in the Northern Hemisphere During Geomagnetic Storms Driven by High‐Speed Streams and Coronal Mass Ejections

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract We present a robust method for estimating the auroral Joule heating in the northern hemisphere by combining SuperMAG, SuperDARN and AMPERE data products. This method is applied to 292 storms during 2010–2023. Temporal evolution and spatial distributions of the storm‐time Joule heating are studied using a superposed epoch analysis, with the ...
H. Vanhamäki, M. Pedersen, A. Aikio, C. Waters, J. Gjerloev, L. Cai, M. Myllymaa, B. Kunduri, K. Sterne, S. Vines, B. Anderson   +10 more
wiley   +1 more source

A new paradigm for solar coronal heating

EPL (Europhysics Letters), 2009
The solar coronal heating problem refers to the question why the temperature of the Sun's corona is more than two orders of magnitude higher than that of its surface. Almost 70 years after the discovery, this puzzle is still one of the major challenges in astrophysics.
Vranjes, Jovo, Poedts, Stefaan
openaire   +3 more sources

Global Ionospheric TEC Variability: Long‐Term Spectral–Wavelet Analysis and Geomagnetic Storm Event Case Studies

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract This study investigates global ionospheric variability using Global Total Electron Content (GTEC), defined as the spatial average of daily averaged Global Ionospheric Maps derived from the International GNSS Service. The analysis spans from 2010 to 2024, covering Solar Cycle 24 and the rising phase of Solar Cycle 25, and incorporates ...
Ramadane Hamed Linjouom Nsangou, Y. Reuveni   +1 more
wiley   +1 more source

Signatures of Coronal Heating Mechanisms

, 2009
Alfven waves created by sub-photospheric motions or by magnetic reconnection in the low solar atmosphere seem good candidates for coronal heating. However, the corona is also likely to be heated more directly by magnetic reconnection, with dissipation ...
E Landi, EN Parker, H Hara, HS Hudson, JV Hollweg, KP Dere, P Antolin, R Rosner, S Moriyasu, T Kudoh, Y Katsukawa, Y Uchida   +11 more
core   +1 more source

Deciphering the “Missing Xenon Paradox” in Celestial Bodies: A Multifaceted Perspective Toward Demystifying This Enigma

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract Xenon (Xe) is a heavy noble gas with intriguing chemical properties, such as having several stable isotopes and the ability to form compounds under extreme conditions. Despite the predictions based on cosmochemical models that suggest xenon should be relatively abundant in planetary reservoirs, empirical data indicate a significant depletion ...
Avinash Kumar Both, Avradip Ghosh, Chin Li Cheung   +2 more
wiley   +1 more source

Transition Region Abundance Measurements During Impulsive Heating Events

, 2015
It is well established that elemental abundances vary in the solar atmosphere and that this variation is organized by first ionization potential (FIP). Previous studies have shown that in the solar corona low-FIP elements, such as Fe, Si, Mg, and Ca, are
Brooks, David H., Doschek, George A., Feldman, Uri, Warren, Harry P.   +3 more
core   +1 more source

Coronal heating distribution due to low-frequency wave-driven turbulence [PDF]

, 2002
The heating of the lower solar corona is examined using numerical simulations and theoretical models of magnetohydrodynamic turbulence in open magnetic regions.
D. J. Mullan, Evje H. O., G. P. Zank, Grappin R., Heinemann M., Hollweg J. V., Hollweg J. V., Isenberg P. A., Kohl J. L., Kopp R. A., L. J. Milano, Marsch E., McKenzie J. F., Nakariakov V. M., Oughton S., P. Dmitruk, S. Oughton, Shebalin J. V., Velli M., W. H. Matthaeus, Zank G. P., Zhou Y.   +21 more
core   +3 more sources