Results 11 to 20 of about 13,868 (214)

Quiet time particle acceleration in interplanetary space [PDF]

Astronomy & Astrophysics, 2005
9 pages, 9 figures; accepted for publication in Astronomy and ...
LEPRETI, Fabio, ISLIKER H, PETRAKI K, VLAHOS L.   +3 more
openaire   +3 more sources

High-energy (>40 MeV) Proton Intensity Enhancements Associated with the Passage of Interplanetary Shocks at 1 au

The Astrophysical Journal, 2023
We analyze periods with elevated >40 MeV proton intensities observed near Earth over a time span of 43 yr (1973–2016) that coincide with the passage of interplanetary (IP) shocks.
D. Lario, I. G. Richardson, A. Aran, N. Wijsen   +3 more
doaj   +1 more source

A Data-driven, Physics-based Transport Model of Solar Energetic Particles Accelerated by Coronal Mass Ejection Shocks Propagating through the Solar Coronal and Heliospheric Magnetic Fields

The Astrophysical Journal Supplement Series, 2023
In an effort to develop computational tools for predicting radiation hazards from solar energetic particles (SEPs), we have created a data-driven physics-based particle transport model to calculate the injection, acceleration, and propagation of SEPs ...
Ming Zhang, Lei Cheng, Ju Zhang, Pete Riley, Ryun Young Kwon, David Lario, Laura Balmaceda, Nikolai V. Pogorelov   +7 more
doaj   +1 more source

Long-duration high-energy proton events observed by GOES in October 1989 [PDF]

Annales Geophysicae, 1998
We consider the prolonged injection of the high-energy (>10 MeV) protons during the three successive events observed by GOES in October 1989. We apply a solar-rotation-stereoscopy approach to study the injection of the accelerated particles from ...
A. Anttila, L. G. Kocharov, J. Torsti, R. Vainio   +3 more
doaj   +1 more source

The energetic storm particle events of 3 November 2021

Frontiers in Astronomy and Space Sciences, 2023
Observations of energetic particles at interplanetary shocks are important to study acceleration mechanisms and their connection with magnetohydrodynamic turbulence.
Federica Chiappetta, Monica Laurenza, Fabio Lepreti, Fabio Lepreti, Simone Benella, Giuseppe Consolini, Maria Federica Marcucci   +6 more
doaj   +1 more source

In Situ Observation of Electron Acceleration by a Double Layer in the Bow Shock

The Astrophysical Journal, 2023
The importance of the electric potential along the field direction in the acceleration of electrons in the quasi-perpendicular bow shock has been proposed.
C. M. Wang, S. Y. Huang, Z. G. Yuan, K. Jiang, J. Zhang, Y. Dong, Q. Y. Xiong   +6 more
doaj   +1 more source

Solar interacting protons versus interplanetary protons in the core plus halo model of diffusive shock acceleration and stochastic re-acceleration [PDF]

, 2015
With the first observations of solar γ-rays from the decay of pions, the relationship of protons producing ground level enhancements (GLEs) on the Earth to those of similar energies producing the γ-rays on the Sun has been debated.
A. Afanasiev, Ackermann M., Afanasiev A., Ajello M., Axford W. I., Chollet E. E., Chollet E. E., Dröge W., Dung R., Fletcher L., Giacalone J., Hu Q., J. M. Ryan, K. Mursula, Kaplan S. A., Kocharov L., Kocharov L., Kocharov L., Kocharov L., Kocharov L., Kocharov L., Kocharov L., Krymsky G. F., L. Kocharov, Laitinen T., Lee M. A., Matthaeus W. H., Mazur J. E., Melrose D. B., Ng C. K., Qin G., R. Vainio, Schlickeiser R., T. Laitinen, Toptygin I. N., Vainio R., Vainio R., Vainio R., van der Holst B., Vörös Z., Wang Y., Zank G. P.   +41 more
core   +1 more source

On the acceleration of energetic particles in the interplanetary medium [PDF]

Journal of Geophysical Research, 1976
Fermi scattering and transit time damping are two possible mechanisms for accelerating low energy protons (approximately 1 Mev) in co-rotating particle streams. Solutions to the equations which govern particle behavior in such streams are presented. It was found that acceleration by Fermi scattering requires a scattering mean-free path more than an ...
openaire   +1 more source

Irregular Proton Injection to High Energies at Interplanetary Shocks

The Astrophysical Journal Letters, 2023
How thermal particles are accelerated to suprathermal energies is an unsolved issue, crucial for many astrophysical systems. We report novel observations of irregular, dispersive enhancements of the suprathermal particle population upstream of a high ...
Domenico Trotta, Timothy S. Horbury, David Lario, Rami Vainio, Nina Dresing, Andrew Dimmock, Joe Giacalone, Heli Hietala, Robert F. Wimmer-Schweingruber, Lars Berger, Liu Yang   +10 more
doaj   +1 more source

Acceleration of Solar Wind Ions by Nearby Interplanetary Shocks: Comparison of Monte Carlo Simulations with Ulysses Observations [PDF]

, 1996
The most stringent test of theoretical models of the first-order Fermi mechanism at collisionless astrophysical shocks is a comparison of the theoretical predictions with observational data on particle populations.
Balogh A., Baring M. G., Baring M. G., Bell A. R., Burton M. E., Decker R. B., Decker R. B., Donald C. Ellison, Ellison D. C., Ellison D. C., Ellison D. C., Fuselier S. A., Fuselier S. A., Giacalone J., Gloeckler G., Gloeckler G., Gosling J. T., Gosling J. T., Gosling J. T., Gosling J. T., Gosling J. T., Hoppe M. M., Hundhausen A. J., Ipavich F. M., Ipavich F. M., Jokipii J. R., Jones F. C., Jones T. W., Keith W. Ogilvie, Kennel C. F., Lanzerotti L. J., Lee M. A., Liewer P. C., Matthew G. Baring, Mobius E., Ogilvie K. W., Phillips J. L., Robert J. Forsyth, Sarris E. T., Scholer M., Tan L. C., Tan L. C., Trattner K. J., Trattner K. J., Tsurutani B. T., Valdes-Galicia J. F., Vasyliunas V. M., Vinas A. F.   +47 more
core   +2 more sources