Results 21 to 30 of about 42,321 (217)

The role of post-sunset vertical drifts at the equator in predicting the onset of VHF scintillations during high and low sunspot activity years [PDF]

Annales Geophysicae, 2006
The day-to-day variability in the occurrence of ionospheric scintillations, which are of serious concern in the trans-ionospheric communications, makes their prediction still a challenging problem.
S. Tulasi Ram, P. V. S. Rama Rao, K. Niranjan, D. S. V. V. D. Prasad, R. Sridharan, C. V. Devasia, S. Ravindran   +6 more
doaj   +1 more source

Monitoring ionospheric scintillations with GNSS in South America

, 2021
At equatorial latitudes, during specific conditions, Global Navigation Satellite System (GNSS) signals traversing the ionospheric layer might experience fluctuations in phase and/or amplitude, the so-called ionospheric scintillations.
Moisés José dos Santos Freitas, Vani, Bruno César, José dos Santos Freitas, Moisés, Salles, Lucas Alves, Alison de Oliveira Moraes, de Oliveira Moraes, Alison, Rodrigues de Paula, Eurico, João Francisco Galera Monico, Eurico Rodrigues de Paula, Bruno César Vani, Fernandes Breder, Victor Hugo, Victor Hugo Fernandes Breder, Galera Monico, João Francisco [UNESP], Lucas Alves Salles   +13 more
core   +1 more source

A comparison between large‐scale irregularities and scintillations in the polar ionosphere

Geophysical Research Letters, 2016
A comparison tool has been developed by mapping the global GPS total electron content (TEC) and large coverage of ionospheric scintillations together on the geomagnetic latitude/magnetic local time coordinates. Using this tool, a comparison between large‐
Y. Wang, Q.‐H. Zhang, P. T. Jayachandran, M. Lockwood, S.‐R. Zhang, J. Moen, Z.‐Y. Xing, Y.‐Z. Ma, M. Lester   +8 more
doaj   +1 more source

GPS scintillations and total electron content climatology in the southern low, middle and high latitude regions

Annals of Geophysics, 2013
In recent years, several groups have installed high-frequency sampling receivers in the southern middle and high latitude regions, to monitor ionospheric scintillations and the total electron content (TEC) changes.
Luca Spogli, Lucilla Alfonsi, Pierre J. Cilliers, Emília Correia, Giorgiana De Franceschi, Cathryn N. Mitchell, Vincenzo Romano, Joe Kinrade, Miguel Angel Cabrera   +8 more
doaj   +1 more source

On the Properties of and Ionospheric Conditions Associated With a Mid‐Latitude Scintillation Event Observed Over Southern United States

Space Weather, 2021
While low and high‐latitude ionospheric scintillation have been extensively reported, significantly less information is available about the properties of and conditions leading to mid‐latitude scintillations.
F. S. Rodrigues, J. G. Socola, A. O. Moraes, C. Martinis, D. A. Hickey   +4 more
doaj   +1 more source

Ionospheric scintillation monitoring and modelling [PDF]

Annals of Geophysics, 2009
This paper presents a review of the ionospheric scintillation monitoring and modelling by the European groups involved in COST 296. Several of these groups have organized scintillation measurement campaigns at low and high latitudes. Some characteristic results obtained from the measured data are presented.
Beniguel, Y., Romano, V., Alfonsi, L., Aquino, M., Bourdillon, A., Cannon, P., De Franceschi, G., Dubey, S., Gherm, V., Forte, B., Jakowski, Norbert, Materassi, M., Noack, Thoralf, Pozoga, M., Rogers, N., Spalla, P., Strangeways, H., Warrington, M., Wernik, A., Wilken, Volker, Zernov, N.   +20 more
openaire   +7 more sources

VHF and L-band scintillation characteristics over an Indian low latitude station, Waltair (17.7° N, 83.3° E) [PDF]

Annales Geophysicae, 2005
Characteristics of simultaneous VHF (244 MHz) and L-band (1.5 GHz) scintillations recorded at a low-latitude station, Waltair (17.7° N, 83.3° E), during the low sunspot activity year of March 2004 to March 2005, suggest that the occurrence of ...
P. V. S. Rama Rao, S. Tulasi Ram, K. Niranjan, D. S. V. V. D. Prasad, S. Gopi Krishna, N. K. M. Lakshmi   +5 more
doaj   +1 more source

Assessment of GRAS Ionospheric Measurements for Ionospheric Model Assimilation

Remote Sensing, 2023
We conducted a study to assess the GNSS (Global Navigation Satellite System) Receiver for Atmospheric Sounding (GRAS) ionospheric data quality by processing Radio Occultation (RO) observations of ionospheric products.
M. M. Hoque, F. S. Prol, M. Hernandez-Pajares, R. Notarpietro, L. Yuan, G. Olivares-Pulido, V. Graffigna, A. Von Engeln, C. Marquardt   +8 more
doaj   +1 more source

SEPARATING NIGHTSIDE INTERPLANETARY AND IONOSPHERIC SCINTILLATION WITH LOFAR [PDF]

The Astrophysical Journal Letters, 2016
ABSTRACT Observation of interplanetary scintillation (IPS) beyond Earth-orbit can be challenging due to the necessity to use low radio frequencies at which scintillation due to the ionosphere could confuse the interplanetary contribution. A recent paper by Kaplan et al.
R. A. Fallows, M. M. Bisi, B. Forte, Th. Ulich, A. A. Konovalenko, G. Mann, C. Vocks   +6 more
openaire   +2 more sources

Analysis of Ionospheric Scintillations Measurement on NavIC Signals

, 2022
: Ionospheric scintillation is a rapid change in amplitude and phase of an electromagnetic signal in the ionospheric environment. Amplitude scintillations indicated by S4 index and phase scintillations by (∅). Low latitude regions are prone to ionosphere
Kaitha Praveena, Prof. D. Krishna Reddy, Prof. Perumalla Naveen Kumar, null null   +3 more
core   +1 more source