Results 71 to 80 of about 14,596 (161)

The non-negligible effect of magnetic holes on the magnitude-of-B magnetic power spectral density of the fast Alfvenic coronal-hole-origin solar wind at 1 AU

Frontiers in Astronomy and Space Sciences
To estimate the effects of magnetic holes on the magnitude of B magnetic power spectral density, a 2-day interval of fast coronal-hole-origin plasma at 1 AU is examined. The magnetic holes are identified and removed from the magnetic time series, and the
Joseph E. Borovsky, Charles W. Smith
doaj   +1 more source

Solar Origins of Short-Term Periodicities in Near-Earth Solar Wind and Interplanetary Magnetic Field

Applied Sciences
This study investigates the solar origins of short-term periodicities in the near-Earth solar wind and interplanetary magnetic field (IMF) using long-term observations (1995–2024) and Potential Field Source Surface modeling.
Huichao Li, Yunxi Zhang, Jinzhou Bao, Botian Tang, Jiangrong Xie, Kangyan Wang   +5 more
doaj   +1 more source

A Comparison of the X-Ray Polarimetric Properties of Stellar and Supermassive Black Holes

The Astrophysical Journal
X-ray polarization provides a new way to probe accretion geometry in black hole systems. If the accretion geometry of black holes is similar regardless of mass, we should expect the same to be true of their polarization properties.
M. Lynne Saade, Philip Kaaret, Ioannis Liodakis, Steven R. Ehlert   +3 more
doaj   +1 more source

The birth of coronal holes [PDF]

Proceedings of the International Astronomical Union, 2004
V.G. Fainshtein, G.V. Rudenko
openaire   +1 more source

Solar Corona Structures Detection and Segmentation Using Deep Neural Networks: A Survey

IEEE Access
Image segmentation and detection of solar corona structures are a critical part of space weather applications. In recent years, deep learning-based techniques have proven to be effective for various automatic solar image processing tasks.
Peter Butka, Martin Sarnovsky, Viera Kresnakova, Simon Mackovjak, Lenka Kaliskova   +4 more
doaj   +1 more source

Energy and Mass Transport Associated with Impulsive Spicular Flows in Solar Coronal Holes

The Astrophysical Journal Letters
How the solar atmosphere is heated from a temperature of about 5000 to 6000 K in the lower atmosphere to about 1–2 MK in the corona has challenged the astrophysical community for nearly 80 yr.
Lei Ni, Jun Lin, Tanmoy Samanta, Guanchong Cheng, Yifu Wang, Robert Erdélyi   +5 more
doaj   +1 more source

Heating solar coronal holes

The Astrophysical Journal, 1991
It has been shown that the coronal hole, and the associated high-speed stream in the solar wind, are powered by a heat input of the order of 500,000 ergs/sq cm s, with most of the heat injected in the first 1-2 solar radii, and perhaps 100,000 ergs/sq cm s introduced at distances of several solar radii to provide the high speed of the issuing solar ...
openaire   +1 more source

Alfvén Waves from Interchange Reconnection at Separators as a Possible Source of Switchbacks

The Astrophysical Journal
Parker Solar Probe has observed Alfvénic fluctuations of amplitude large enough to occasionally reverse the local magnetic field direction—a phenomenon known as a switchback. Some have attributed switchbacks to reconnection in the low corona between open
Dana Longcope, Philip Klaassen
doaj   +1 more source

The modeling of quasi-periodic oscillations propagation in the solar corona

Современная наука и инновации
In the general problem of oscillations observed in the solar corona, a particularly intriguing position is occupied by quasi-periodic oscillations, which are often observed in coronal holes.
N. K. Shividov, A. K. Baltykov, T. V. Velegurin, G. A. Mankaeva, B. B. Mikhalyaev   +4 more
doaj   +1 more source

Coronal Holes and Open Magnetic Flux over Cycles 23 and 24. [PDF]

Sol Phys, 2017
Lowder C, Qiu J, Leamon R.
europepmc   +1 more source