Results 51 to 60 of about 932 (205)

Proton Cyclotron Waves and Pickup Ion Ring Distribution Instabilities Upstream of Mars

Geophysical Research Letters, Volume 51, Issue 21, 16 November 2024.
Abstract Proton cyclotron waves (PCWs) upstream of Mars are thought to be associated with the instabilities of pickup ions. The instabilities of pickup ions of ring distributions have larger maximum growth rates compared with beam distributions.
Kun Cheng, Kaijun Liu, Ameneh Mousavi, Misa Cowee, Xianming Zheng, Jingyi Zhou, Yan Wang, Yuqi Liu, Xinye Wang   +8 more
wiley   +1 more source

Consequences of Hot Electrons for the Structure of the Outer Heliosphere

The Astrophysical Journal
The temperature of electrons is largely unknown in the outer heliosphere because there is a gap in Voyager measurements from ∼3 eV to 22 keV. Most models assume that the electrons have the same temperature as the bulk cold thermal solar wind (10 ^4 K ...
Ethan Schuyler Bair, Merav Opher, Marc Zachary Kornbleuth, Bertalan Zieger, Gabor Toth, Bart van der Holst   +5 more
doaj   +1 more source

On the Anisotropic Velocity Distribution of Newborn Pickup Ions in the Heliosheath

The Astrophysical Journal Letters
The evolution of the velocity distribution of pickup ions is crucial for understanding the energetic neutral atom (ENA) fluxes observed by Interstellar Boundary Explorer.
Senbei Du, Merav Opher, Marc Kornbleuth
doaj   +1 more source

Mapping the magnetic mayhem in the heliosheath [PDF]

Eos, Transactions American Geophysical Union, 2011
When Voyager 1 passed into the heliosheath in 2004, it became the first human‐made object to explore the remote edge of the Sun's magnetic influence. The heliosheath, between 1.5 and 15 billion kilometers thick and starting roughly 14 billion kilometers from the Sun, is where the outgoing flows of solar wind start to be pushed back by interstellar ...
openaire   +1 more source

Ionization rates in the heliosheath and in astrosheaths [PDF]

Astronomy & Astrophysics, 2014
K.S. and H.F. are grateful to the Deutsche Forschungsgemeinschaft, DFG for funding the projects FI706/15-1 and SCHE334/10-1. M.B. was supported by the Polish Ministry for Science and Higher Education grant N-N203-513-038, managed by the National Science Centre. S.E.S.F. thanks the South African National Research Foundation for financial support.
Scherer, K., Ferreira, S.E.S., Fichtner, H., Fahr, H.-J., Bzowski, M.   +4 more
openaire   +2 more sources

Magnetic Decreases (MDs) and mirror modes: two different plasma β changing mechanisms [PDF]

Nonlinear Processes in Geophysics, 2010
We discuss two different physical processes that create localized high β plasma regions. One is nonlinear wave-steepening, generating magnetic decreases (MDs) by a ponderomotive force.
E. Echer, F. L. Guarnieri, O. P. Verkhoglyadova, G. S. Lakhina, B. T. Tsurutani   +4 more
doaj   +1 more source

SCALING OF THE GROWTH RATE OF MAGNETIC ISLANDS IN THE HELIOSHEATH [PDF]

The Astrophysical Journal, 2012
Current sheets thinner than the ion inertial length are unstable to the tearing instability and will develop magnetic islands that grow due to magnetic reconnection. We investigate whether the growth of magnetic islands in a current sheet can continue indefinitely, or in the case of the heliosheath until reaching a neighboring current sheet, and at ...
Schoeffler, K. M., Drake, J. F., Swisdak, M.   +2 more
openaire   +2 more sources

A model for the nose region of the heliosheath

Journal of Physics: Conference Series, 2015
The Voyager 1 spacecraft is currently in the vicinity of the heliopause, which separates the heliosphere from the local interstellar medium. There has been a precipitous decrease in particles accelerated in the heliosphere, and a substantial increase in galactic cosmic rays (GCRs), suggesting easy escape of the former across the heliopause, and entry ...
L A Fisk, G Gloeckler
openaire   +1 more source

LOW ENERGY NEUTRAL ATOMS FROM THE HELIOSHEATH

The Astrophysical Journal, 2014
In the heliosheath beyond the termination shock, low energy (
Fuselier S.A., Allegrini F., Bzowski M., Dayeh M.A., Desai M., Funsten H.O., Galli A., Heirtzler D., Janzen P., Kubiak M.A., Kucharek H., Lewis W., Livadiotis G., McComas D.J., Möbius E., Petrinec S.M., Quinn M., Schwadron N., Sokól J.M., Trattner K.J., Wood B.E., Wurz P.   +21 more
openaire   +1 more source

Large-scale Field-aligned Flows in the Heliosheath

The Astrophysical Journal
We use a state-of-the-art 3D MHD simulation to show that large-scale thermal pressure gradients in the heliosheath drive suprathermal particles (pickup ions with 1–5 keV) to stream along magnetic field lines faster than the cold bulk solar wind.
Merav Opher, Marc Kornbleuth, Rob Decker, John Richardson, Ethan Bair, Kostas Dialynas, Romina Nikoukar, Matthew E. Hill, Senbei Du, Vladimir Florinski   +9 more
doaj   +1 more source