Results 61 to 70 of about 585,007 (286)
The structure of helical interplanetary magnetic fields
Geophysical Research Letters, 1991 The interplanetary magnetic field is known to be highly helical. Although the detailed spatial structure of the fields has yet to be elucidated, the helicity spectrum has been conjectured to result from a random walk in direction of a constant magnitude magnetic field vector.
D. A. Roberts +2 more
openaire +2 more sources
Conjugate auroras and the interplanetary magnetic field [PDF]
Journal of Geophysical Research: Space Physics, 1997 Earlier results from analyses of auroral all‐sky data obtained on several series of conjugate flights along the College, Alaska, magnetic meridian are reevaluated, and it is suggested that while the diffuse aurora is conjugate, the discrete aurora is nonconjugate but still on closed field lines.
H. C. Stenbaek-Nielsen, A. Otto
openaire +2 more sources
Geophysical Research Letters, Volume 52, Issue 9, 16 May 2025.Abstract This study demonstrates the influence of electromagnetic ion cyclotron (EMIC) rising‐tone emissions on relativistic electrons in the inner magnetosphere using data obtained from the Van Allen Probes and Arase satellites. We find that the intense EMIC rising‐tone emissions occur during the increase in the solar wind pressures, creating ...
Chae‐Woo Jun +12 more
wiley +1 more source
Interplanetary magnetic field control of dayside transient event occurrence and motion in the ionosphere and magnetosphere [PDF]
Annales Geophysicae, 2004 The pressure pulse model for dayside transient ionospheric events predicts dawnward moving events at and prior to local noon during periods of spiral interplanetary magnetic field (IMF) orientation, but duskward moving events at and after local noon ...
G. I. Korotova +4 more
doaj +1 more source
Parametric study of the solar wind interaction with the Hermean magnetosphere for a weak interplanetary magnetic field [PDF]
, 2016 The aim of this study is to simulate the interaction of the solar wind with the Hermean magnetosphere when the interplanetary magnetic field is weak, performing a parametric study for all the range of hydrodynamic values of the solar wind predicted on Mercury for the ENLIL + GONG WSA + Cone SWRC model: density from $12$ to $180$ cm$^{-3}$, velocity ...
arxiv +1 more source
Geophysical Research Letters, Volume 52, Issue 9, 16 May 2025.Abstract In this study, we analyze a discontinuous negative storm evolution process in the ionosphere over the East Asian region during the recovery phase of the geomagnetic storms on 20 and 21 November 2003, using data from the Global Ultraviolet Imager (GUVI) for [O] and [N2] column density ratio (Σ[O]/[N2]), Total Electron Content (TEC), as well as ...
Xu Guo +11 more
wiley +1 more source
Magnetic field-line lengths inside interplanetary magnetic flux ropes [PDF]
, 2015 We report on the detailed and systematic study of field-line twist and length distributions within magnetic flux ropes embedded in Interplanetary Coronal Mass Ejections (ICMEs). The Grad-Shafranov reconstruction method is utilized together with a constant-twist nonlinear force-free (Gold-Hoyle) flux rope model to reveal the close relation between the ...
arxiv +1 more source
Predicting CO Cameron‐Band Auroral Emission at Venus Using VEx Electron Observations
Geophysical Research Letters, Volume 52, Issue 9, 16 May 2025.Abstract Various types of auroral emissions have been observed at (partially) magnetized planets (e.g., Earth, Jupiter, and Mars). Auroral emissions have also been observed at Venus, an unmagnetized planet, by the Pioneer Venus Orbiter (PVO) and ground‐based telescopes.
Shaosui Xu +7 more
wiley +1 more source
Magnetic field disturbances in the sheath region of a super-sonic interplanetary magnetic cloud [PDF]
Annales Geophysicae, 2008 It is well-known that interplanetary magnetic clouds can cause strong geomagnetic storms due to the high magnetic field magnitude in their interior, especially if there is a large negative Bz component present.
E. Romashets, M. Vandas, S. Poedts
doaj +1 more source
Temporal Offsets between Maximum CME Speed Index and Solar, Geomagnetic, and Interplanetary Indicators during Solar Cycle 23 and the Ascending Phase of Cycle 24 [PDF]
, 2016 On the basis of morphological analysis of yearly values of the maximum CME (coronal mass ejection) speed index, the sunspot number and total sunspot area, sunspot magnetic field, and solar flare index, the solar wind speed and interplanetary magnetic field strength, and the geomagnetic Ap and Dst indices, we point out the particularities of solar and ...
arxiv +1 more source