Results 51 to 60 of about 3,881 (215)

A study of density modulation index in the inner heliospheric solar wind during solar cycle 23 [PDF]

, 2014
The ratio of the rms electron density fluctuations to the background density in the solar wind (density modulation index, $\epsilon_{N} \equiv \Delta{N}/N$) is of vital importance in understanding several problems in heliospheric physics related to solar
Ananthakrishnan, S., Bisoi, Susanta Kumar, Fujiki, K., Ingale, M., Janardhan, P., Subramanian, P., Tokumaru, M.   +6 more
core   +1 more source

The Evolution of the Ionospheric Irregularities and Their Effects on GNSS Over China During the Geomagnetic Storm on 1 December 2023

Space Weather, Volume 24, Issue 4, April 2026.
Abstract This study investigated a large‐scale ionospheric irregularities event over low‐ to mid‐latitude China during the 1 December 2023 geomagnetic storm using ROTI data, loss‐of‐lock (LoL) in L2 from 250 GNSS receivers, and S4 data from 16 ISMs.
Yi Zeng, Donghe Zhang, Ke Li, Yaoyu Tian, Guanglin Yang   +4 more
wiley   +1 more source

The use of interplanetary scintillation maps in the prediction of geomagnetic activity [PDF]

Annales Geophysicae, 1996
Interplanetary scintillation (IPS), the twinkling of small angular diameter radio sources, arises from the interaction of the signal with small-scale plasma irregularities in the solar wind.
E. A. Lucek, T. D. G. Clark
doaj   +1 more source

A Twenty Year Decline in Solar Photospheric Magnetic Fields: Inner-Heliospheric Signatures and Possible Implications?

, 2015
We report observations of a steady 20 year decline of solar photospheric fields at latitudes $\geq$45${^{o}}$ starting from $\sim$1995. This prolonged and continuing decline, combined with the fact that Cycle 24 is already past its peak, implies that ...
Ananthakrishnan, S., Bisoi, Susanta Kumar, Fujiki, K., Janardhan, P., Jose, L., Sridharan, R., Tokumaru, M.   +6 more
core   +1 more source

State of the Early Career Profession in Space Physics and Aeronomy: Climatological Survey Results

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract The American Geophysical Union (AGU) Space Physics & Aeronomy (SPA) section comprises scientists who study the Sun, solar wind, and planetary magnetospheres, ionospheres, and thermospheric/mesospheric systems along with their interconnections.
R. C. Allen, B. Gallardo‐Lacourt, S. Raptis, C. R. Gilly, L. C. Gasque, B. L. Alterman, J. C. Buitrago‐Casas, E. P. Macho, G. Malhotra, R. M. McGranaghan, P. Mostafavi, S. K. Vines   +11 more
wiley   +1 more source

Characterizing the Role of Storm‐Time High‐Latitude Ionospheric Structures in GPS Position Accuracy in Antarctica: May 2024 Storm

Space Weather, Volume 24, Issue 4, April 2026.
Abstract This study investigates the impact of high‐latitude ionospheric irregularities on global positioning system (GPS) position accuracy during the 10–11 May 2024 geomagnetic storm. Using data from ground‐based GPS receivers and an all‐sky camera in Antarctica, we examined evolution of GPS vertical total electron content, phase fluctuations, and ...
Waqar Younas, Yukitoshi Nishimura, Weixuan Liao, Josh L. Semeter, Sebastijan Mrak, Y. Jade Morton, Keith M. Groves, Tetsuo Motoba, Tim Everett   +8 more
wiley   +1 more source

Tomography of the solar wind using interplanetary scintillation [PDF]

Journal of Astrophysics and Astronomy, 2000
Extended AbstractInterplanetary scintillation (IPS) measurements are sensitive to a weighted sum of the properties of solar wind (SW) along the line-of-sight (los) to a distant compact radio source. Mapping alosback to the surface of the Sun provides information of the sites of origin of the SW sampled by thelos.
Oberoi, D, Rao, AP
openaire   +2 more sources

Turbulence‐Resilient Coherent Receiver Array on CMOS‐Compatible Silicon Photonics for Free Space Optical Communications

Nanophotonics, Volume 15, Issue 5, 16 March 2026.
A CMOS‐compatible silicon‐photonic 4 × 4 coherent receiver array spatially samples turbulence‐distorted wavefronts and, with maximum‐ratio combining, enables signal recovery. Experimental BPSK tests under moderate turbulence approach theoretical combining efficiency, reducing BER from 1E‐2 to 1E‐15.
Alireza Fardoost, Fatemeh Ghaedi Vanani, Aneesh Sobhanan, Dhruvkumar Desai, Inwoong Kim, Olga Vassilieva, Paparao Palacharla, Guifang Li   +7 more
wiley   +1 more source

Iterative Tomography: A Key to Providing Time-Dependent 3-D Reconstructions of the Inner Heliosphere and the Unification of Space Weather Forecasting Techniques

Frontiers in Astronomy and Space Sciences, 2020
Over several decades, UCSD has developed and continually updated a time-dependent iterative three-dimensional (3-D) reconstruction technique to provide global heliospheric parameters—density, velocity, and component magnetic fields.
Bernard V. Jackson, Andrew Buffington, Lucas Cota, Dusan Odstrcil, Dusan Odstrcil, Mario M. Bisi, Richard Fallows, Munetoshi Tokumaru   +7 more
doaj   +1 more source

Interplanetary Consequences of a Large CME

, 2009
We analyze a coronal mass ejection (CME) which resulted from an intense flare in active region AR486 on November 4, 2003. The CME propagation and speed are studied with interplanetary scintillation images, near-Earth space mission data, and Ulysses ...
Agalya, G., Begum, S. Shaheda, Lahkar, M., Mahalakshmi, K., Manoharan, P. K., Prabhu, K., Revathi, P.   +6 more
core   +1 more source