Results 31 to 40 of about 17,672 (303)

Solar Electron Beam—Langmuir Wave Interactions and How They Modify Solar Electron Beam Spectra: Solar Orbiter Observations of a Match Made in the Heliosphere

The Astrophysical Journal, 2023
Solar Orbiter's four in situ instruments have recorded numerous energetic electron events at heliocentric distances between 0.5 and 1 au. We analyze energetic electron fluxes, spectra, pitch-angle distributions, associated Langmuir waves, and type III ...
Camille Y. Lorfing, Hamish A. S. Reid, Raúl Gómez-Herrero, Milan Maksimovic, Georgios Nicolaou, Christopher J. Owen, Javier Rodriguez-Pacheco, Daniel F. Ryan, Domenico Trotta, Daniel Verscharen   +9 more
doaj   +1 more source

Experimental and Analytical Studies of Merging Plasma Loops on the Caltech Solar Loop Experiment [PDF]

, 2011
Of crucial importance for magnetized plasmas is magnetic helicity, a topological quantity that measures the knottedness or twistedness of the magnetic field. A universal relaxation theory, applicable to astrophysical and laboratory plasmas, dictates the
Perkins, Rory James
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28 OCTOBER 2003 FLARE: HIGH-ENERGY GAMMA EMISSION, TYPE II RADIO EMISSION AND SOLAR PARTICLE OBSERVATIONS [PDF]

International Journal of Modern Physics A, 2005
The 28 October 2003 flare gave us the unique opportunity to compare the acceleration time of high-energy protons with the escaping time of those particles which have been measured onboard spacecraft and by neutron monitors network as GLE event. High-energy emission time scale and shock wave height and velocity time dependencies were also studied.
S. N. KUZNETSOV, V. G. KURT, B. YU. YUSHKOV, I. N. MYAGKOVA, K. KUDELA, A. V. BELOV, C. CAROUBALOS, A. HILARIS, H. MAVROMICHALAKI, X. MOUSSAS, P. PREKA-PAPADEMA   +10 more
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The Common Origin of High-energy Protons in Solar Energetic Particle Events and Sustained Gamma-Ray Emission from the Sun [PDF]

The Astrophysical Journal, 2021
Abstract We report that the number of >500 MeV protons (Ng ) inferred from sustained gamma-ray emission (SGRE) from the Sun is significantly correlated with that of protons propagating into space (N SEP) as solar energetic particles (SEPs). Under the shock paradigm for SGRE, shocks driven by coronal
N. Gopalswamy, S. Yashiro, P. Mäkelä, H. Xie, S. Akiyama   +4 more
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67. Solar radio emission and the acceleration of magnetic-storm particles [PDF]

Symposium - International Astronomical Union, 1957
The shift of the emitted frequencies towards lower frequencies during a solar outburst is usually interpreted as due to a progressive rarefaction of the emitting gas. If one assumes that the emitted frequency is identical with the plasma frequency and furthermore that the density of the emitting plasma is similar to the density of the solar corona at ...
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CAST constraints on the axion-electron coupling [PDF]

, 2013
In non-hadronic axion models, which have a tree-level axion-electron interaction, the Sun produces a strong axion flux by bremsstrahlung, Compton scattering, and axiorecombination, the "BCA processes." Based on a new calculation of this flux, including ...
Barth, Klaus, Belov, A., Hoffmann, D.H.H., Eleftheriadis, Christos, Miller, David W., Zioutas, K., Franz, Jürgen, Englhauser, J., Franz, J., Lakic, B., Villar, J., Gninenko, Sergei, Vieira, Joaquin D., Papaevangelou, Thomas, Riege, H., Ferrer-Ribas, E., Liolios, Anastasios, Walckiers, L., Walckiers, Louis, Kotthaus, R., Eleftheriadis, C., Belov, Alexander, Stewart, L., Pivovaroff, Mike J., Ruz, Jaime, Gómez, Héctor, Villar, José A., Davenport, Martyn, Luzón, Gloria, Jacoby, J., Semertzidis, Y., Königsmann, K., Heinsius, Fritz-Herbert, Savvidis, Ilias, Beltran, Berta, Hasinoff, M.D., Jacoby, Joachim, Vieira, J., Hoffmann, Dieter H. H., Giomataris, I., Vogel, J., Collar, J.I., García, J. A., Hasinoff, Michael D., Miller, D.W., Pivovaroff, M., Lutz, Gerhard, Carmona, J., Jakovcic, K., Jakovčić, Kresimir, Galan, J., Irastorza, I.G., Liolios, A., García, J., Ljubičić, Ante, Redondo, Javier, Friedrich, P., Heinsius, F.H., Collar, Juan I., Giomataris, Ioanis, Englhauser, Jakob, Vogel, Julia K., Kang, Donghwa, Bräuninger, Heinrich, Lutz, G., Fanourakis, G., Dafni, T., Villar, J.A., Krčmar, Milica, Bräuninger, H., Raffelt, G., Friedrich, Peter, Carmona, José Manuel, Di Lella, Luigi, Riege, Hans, Davenport, M., Rodríguez, A., Geralis, Theodoros, Kang, D., Stewart, Laura, Savvidis, I., Vieira, J.D., Fischer, H., Ljubicic, A., Pivovaroff, M.J., Galán, Javier, Collar, J., Fanourakis, George, Beltran, B., Ferrer-Ribas, Ester, Kuster, M., Luzon, G., Carmona, J.M., Papaevangelou, T., Miller, D., Irastorza, Igor Garcia, Zioutas, Konstantin, Ruz, J., Irastorza, I., Garcia, J.A., Hoffmann, D., Fischer, Horst, Dafni, Theopisti, Kousouris, Konstantinos, Raffelt, Georg, Heinsius, F., Kousouris, K., Van Bibber, K., Vogel, J.K., Barth, K., Hasinoff, M., Redondo, J., Di Lella, L., Krcmar, M., Königsmann, Kay, Gninenko, S., Lakić, Biljana, Bibber, Karl van, Gomez, H., Geralis, T., Kotthaus, Rainer, Semertzidis, Yannis   +121 more
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Type II Radio Emission and Solar Particle Observations

, 2010
International Journal of Modern Physics A, Volume 20, Issue 29, pp. 6705-6707 (2005)
Kuznetsov, S. N., Kurt, V. G., Yushkov, B., Yu, B., Myagkova, I. N., Kudela, K., Belov, A. V., Caroubalos, C., Hilaris, A., Mavromichalaki, H., Moussas, X., Preka-Papadema, P.   +11 more
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Observation of solar high energy gamma and X-ray emission and solar energetic particles

Journal of Physics: Conference Series, 2015
We considered 18 solar flares observed between June 2010 and July 2012, in which high energy >100 MeV γ-emission was registered by the Large Area Telescope (LAT) aboard FermiGRO. We examined for these γ-events soft X-ray observations by GOES, hard X-ray observations by the Anti-Coincidence Shield of the SPectrometer aboard INTEGRAL (ACS SPI) and the
Struminsky, Alexei, Gan, Weiqun
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A case study of HF radar spectral width in the post midnight magnetic local time sector and its relationship to the polar cap boundary [PDF]

, 2002
International audienceThe aim of this paper is to advance the current understanding of the spectral width parameter observed by coherent high frequency (HF) radars. In particular, we address the relationship of a frequently observed gradient, between low
J. A. Davies, Davies, J.A., Eglitis, P., P. Eglitis (7605143), P. Eglitis, Woodfield, E.E., Lester, M., M. Lester, J. A. Davies (4412452), Emma E. Woodfield (7657994), M. Lester (7589660), Davies, J. A., E. E. Woodfield, Woodfield, E. E.   +13 more
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Statistical Relationship between Long-duration High-energy Gamma-Ray Emission and Solar Energetic Particles

The Astrophysical Journal, 2023
Abstract Large solar eruptions are often associated with long-duration γ-ray emission extending well above 100 MeV. While this phenomenon is known to be caused by high-energy ions interacting with the solar atmosphere, the underlying dominant acceleration process remains under debate.
A. Bruno, G. A. de Nolfo, J. M. Ryan, I. G. Richardson, S. Dalla   +4 more
openaire   +3 more sources