Results 51 to 60 of about 34,498 (251)

Impact of a Coronal Mass Ejection on the Lunar Exosphere as Observed by CHACE‐2 on the Chandrayaan‐2 Orbiter

Geophysical Research Letters, Volume 52, Issue 15, 16 August 2025.
Abstract The Moon encountered an extreme space weather event (NOAA G5 class) on 10 May 2024, caused by a series of coronal mass ejections (CMEs). Chandra's Atmospheric Composition Explorer‐2 (CHACE‐2), a neutral gas mass spectrometer on board Chandrayaan‐2 orbiter, made in situ observations of the lunar exosphere during this period.
M. B. Dhanya, Chemukula Mathin Yadav, Smitha V. Thampi, Tirtha Pratim Das, R. Satheesh Thampi, Anil Bhardwaj   +5 more
wiley   +1 more source

Perturbazioni geomagnetiche, aurorali, ionosferiche e dei raggi cosmici : interdipendenze e relazioni con l'attività solare

Annals of Geophysics, 1966
Existence of interplanetary magnetic fields other than<br />the geomagnetic field is now well established. They travel as frozen-in<br />fields inside the solar plasma clouds: magnetic fields on the Sun are then<br />discussed ...
F. Molina, F. Mariani
doaj   +1 more source

Calibration of Electrically Short Antennas Using the l = 2 Spherical Harmonic Expansion Coefficients of the Radio Brightness Distribution on the Sky Between 0.5 and 6.8 MHz

Radio Science, Volume 60, Issue 8, August 2025.
Abstract A space‐borne radio‐frequency antenna is typically located in the vicinity of a conductive spacecraft body that influences its beam. Also, at wavelengths that greatly exceed the sizes of such an antenna and spacecraft, the antenna is expected to have the beam of an equivalent short dipole.
Brent Page, Alain Lecacheux, Marc Pulupa, Stuart D. Bale   +3 more
wiley   +1 more source

Magnetic Cloud and Its Interplanetary Shock Sheath as a Modulator of the Cosmic Ray Intensity [PDF]

Journal of Astronomy and Space Sciences, 2008
Forbush Decreases (FDs) are representative events of abrupt decrease in galactic cosmic ray intensity. They are known to be strongly associated with solar wind events such as interplanetary shock (IP shock) and magnetic cloud (MC).
Su Yeon Oh
doaj   +1 more source

Double Auroral Undulation During the Main Phase of the May 10–11, 2024 Storm

AGU Advances, Volume 6, Issue 4, August 2025.
Abstract We report the discovery of a new type of aurora, namely, double auroral undulation that occurred simultaneously on both equatorward and poleward edges of the duskside auroral oval during the main phase of the May 10–11, 2024 superstorm. Whereas the equatorward auroral undulation (EAU) has been frequently observed and well known, the poleward ...
Yongliang Zhang, Tetsuo Motoba, Larry Paxton, Robert Schaefer   +3 more
wiley   +1 more source

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, M. L. Goldstein, C. A. Fitch   +2 more
openaire   +2 more sources

MAVEN Observations of Metallic Fe+ Distributions in the Martian Ionosphere

Geophysical Research Letters, Volume 52, Issue 14, 28 July 2025.
Abstract Metallic ions deposited in planetary atmospheres via meteoroid ablation are an invaluable tool for understanding electric fields, atmospheric winds, and minor ion transport. At Mars, metallic ion distributions are poorly understood. We analyze MAVEN/NGIMS Fe+ ${\mathrm{F}\mathrm{e}}^{+}$ distributions in the Martian ionosphere over the period ...
A. R. Poppe, G. A. Collinson, M. Benna, S. W. Stone, J. M. C. Plane, C. M. Fowler, S. Xu   +6 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, D. G. Sibeck, H. J. Singer, T. J. Rosenberg, M. J. Engebretson   +4 more
doaj   +1 more source

Unveiling the Global Characteristics of Turbulence in the Venusian Space Environment

Geophysical Research Letters, Volume 52, Issue 14, 28 July 2025.
Abstract Turbulence plays a crucial role in energy transfer from large to small scales in solar wind‐Venus interaction. Observations have identified magnetic field fluctuations and turbulence in the Venusian space environment. However, due to limited observations and simulation resolutions, neither the global characteristics nor the driving mechanisms ...
Tong Dang, Jiuhou Lei, Binzheng Zhang, Sudong Xiao, Tielong Zhang, Jiansen He, Junjie Chen, Maodong Yan, Zhonghua Yao   +8 more
wiley   +1 more source

Structure of the Turbulent Interplanetary Magnetic Field [PDF]

The Astrophysical Journal, 2006
We show that two widely used but apparently different models of the turbulent interplanetary magnetic field are closely related. One of these is the so-called quasi-static turbulence model, in which interplanetary magnetic field fluctuations are generated at a source surface near the Sun by random transverse plasma motions (such as supergranulation at ...
Joe Giacalone, J. R. Jokipii, William H. Matthaeus   +2 more
openaire   +2 more sources