Results 91 to 100 of about 585,007 (286)

Study of Interplanetary Magnetic Field with Ground State Alignment [PDF]

, 2010
We demonstrate a new way of studying interplanetary magnetic field -- Ground State Alignment (GSA). Instead of sending thousands of space probes, GSA allows magnetic mapping with any ground telescope facilities equipped with spectropolarimeter. The polarization of spectral lines that are pumped by the anisotropic radiation from the Sun is influenced by
arxiv   +1 more source

Extended Scenarios for Solar Radio Emissions With Downshifted Electron Beam Plasma Excitations

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract First‐principle studies of radiative processes aimed at explaining the origin of type II and type III solar radio bursts raise questions on the implications of downshifted electron beam plasma excitations with frequency (slightly) below the plasma frequency ω≲ωpe $\left(\omega \lesssim {\omega }_{pe}\right)$ in the generation of radio ...
M. Lazar, R. A. López, S. M. Shaaban, S. Poedts, H. Fichtner   +4 more
wiley   +1 more source

Occurrence of Equatorial Plasma Bubbles during Intense Magnetic Storms

International Journal of Geophysics, 2011
An important issue in low-latitude ionospheric space weather is how magnetic storms affect the generation of equatorial plasma bubbles. In this study, we present the measurements of the ion density and velocity in the evening equatorial ionosphere by the
Chao-Song Huang
doaj   +1 more source

Statistical Study of Magnetic Overshoots at Collisionless Shocks

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract We use data from the Magnetospheric Multiscale, Solar Orbiter, and Cassini spacecraft to statistically study magnetic overshoots at Earth's bow shock, interplanetary shocks, and Saturn's bow shock. The size of the magnetic overshoot exhibits a clear positive correlation with the Alfvénic Mach number and its dependence on the upstream plasma ...
M. Lindberg, H. Hietala, K. Shirazul, D. Trotta, A. H. Sulaiman, B. L. Burkholder, A. Dimmock   +6 more
wiley   +1 more source

The Role of the Magnetic Field Orientation on the Variability of the Martian Topside Ionosphere Using MARSIS‐Mars Express Data

Journal of Geophysical Research: Planets, Volume 130, Issue 5, May 2025.
Abstract Mars, without a global dipole magnetic field, has its atmosphere directly exposed to the impinging solar wind, producing a complex interaction due to the remnant crustal magnetic fields, which, especially in the southern hemisphere, have spatially varying strengths and inclinations. “Mini‐magnetospheres” generated over the strong crustal field
Dikshita Meggi, Beatriz Sánchez‐Cano, Mark Lester, Simon Joyce, Katerina Stergiopoulou, Catherine Regan, David Andrews, Shaosui Xu, Xiaohua Fang, Olivier Witasse, Christopher M. Fowler   +10 more
wiley   +1 more source

Interplanetary magnetic structures guiding solar relativistic particles [PDF]

, 2011
Relating in situ measurements of relativistic solar particles to their parent activity in the corona requires understanding the magnetic structures that guide them from their acceleration site to the Earth. Relativistic particle events are observed at times of high solar activity, when transient magnetic structures such as Interplanetary Coronal Mass ...
arxiv   +1 more source

Thermospheric Orthohelium, He23S $\mathrm{H}\mathrm{e}\left({\mathrm{2}}^{\mathrm{3}}\mathrm{S}\right)$, Variations Associated With a Moderate Storm in February 2023: The NIRAS‐2 Observations at the Kjell Henriksen Observatory (78.1°N, 16.0°E), Svalbard

Space Weather, Volume 23, Issue 5, May 2025.
Abstract This study presents the time variability of metastable orthohelium, He23S $\mathrm{H}\mathrm{e}\left({\mathrm{2}}^{\mathrm{3}}\mathrm{S}\right)$, in the polar region associated with a geomagnetic storm. A data set consisting of continuous observations of He23S $\mathrm{H}\mathrm{e}\left({\mathrm{2}}^{\mathrm{3}}\mathrm{S}\right)$ airglow ...
Takanori Nishiyama, Masato Kagitani, Tikemani Bag, Takuo T. Tsuda, Yuki Iwasa, Yasunobu Ogawa, Fred Sigernes   +6 more
wiley   +1 more source

Large-scale properties of the interplanetary magnetic field [PDF]

Early theoretical work of Parker is presented along with the observational evidence supporting his Archimedes spiral model. Variations present in the interplanetary magnetic field from the spiral angle are related to structures in the solar wind.
Schatten, K. H.
core   +2 more sources

Detection and analysis of short-period geomagnetic perturbations during increased solar activity and magnetic storms

E3S Web of Conferences, 2018
The dynamics of geomagnetic field variations on the eve and during the periods of magnetic storms of 2015 and 2017 has been studied (data of the horizontal component of the Earth’s magnetic field of the terrestrial station network were used).
Mandrikova Oksana, Solovev Igor, Zaitsev Alexander   +2 more
doaj   +1 more source

The Open Flux Problem [PDF]

, 2017
The heliospheric magnetic field is of pivotal importance in solar and space physics. The field is rooted in the Sun's photosphere, where it has been observed for many years. Global maps of the solar magnetic field based on full disk magnetograms are commonly used as boundary conditions for coronal and solar wind models.
arxiv   +1 more source