Zobrazeno 1 - 10
of 67
pro vyhledávání: '"Santimay Basu"'
Publikováno v:
Journal of Atmospheric and Solar-Terrestrial Physics. 64:1745-1754
The ionosphere often becomes turbulent and develops electron density irregularities. These irregularities scatter radio waves to cause amplitude and phase scintillation and affect satellite communication and GPS navigation systems. The effects are mo
Autor:
Santimay Basu, H.-C. Yeh, P. J. Sultan, Sunanda Basu, Patricia H. Doherty, Frederick J. Rich, Jules Aarons, E. MacKenzie, Keith M. Groves, Cesar E. Valladares, S.-Y. Su, Terence Bullett
Publikováno v:
Journal of Geophysical Research: Space Physics. 106:30389-30413
In this paper we present a study of the ionospheric effects of a halo coronal mass ejection (CME) initiated on the Sun on September 20, 1999, and causing the largest magnetic storm during this month on September 22–23, 1999, with the hourly Dst ind
Publikováno v:
Geophysical Research Letters. 28:119-122
Spaced receiver observations of amplitude scintillations on a 244 MHz signal, at an equatorial station, have been used to study random temporal changes associated with the scintillation-producing irregularities and the variability of their motion. Th
Publikováno v:
Radio Science. 35:209-224
The presence of scintillation-producing irregularities in the nighttime equatorial ionosphere, in the path of Global Positioning System (GPS) signals received at an equatorial station, causes dual-frequency measurements of the differential carrier ph
Publikováno v:
Journal of Atmospheric and Solar-Terrestrial Physics. 61:1219-1226
With increasing reliance on space-based platforms for global navigation and communication, concerns about the impact of ionospheric scintillation on these systems have become a high priority. Recently, the Air Force Research Laboratory (AFRL) perform
Publikováno v:
Journal of Geophysical Research: Space Physics. 103:3957-3967
The nonlinear evolution of plasma bubbles in the equatorial ionosphere has been computed using an inhomogeneous magnetic-flux-tube-integrated model. We find that plasma bubbles develop in a fundamentally different manner with northern and southern he
Autor:
Charles S. Carrano, Santimay Basu, Sunanda Basu, Eileen MacKenzie, Keith M. Groves, Todd R. Pedersen, Jeffrey M. Holmes
Publikováno v:
2013 US National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM).
Polar cap patches are localized enhancements in ionospheric density which originate from solar EUV ionization on the dayside, enter the polar cap at the dayside cusp, convect anti-sunward at km/s velocities, and exit the polar cap near midnight to me
Publikováno v:
Geophysical Research Letters. 22:881-884
The seasonal and UT variation of mesoscale structures (10 km - 100 m) in the central polar cap has been obtained from an analysis of 250-MHz intensity scintillation observations made at Thule, Greenland. It has been established earlier that mesoscale
Publikováno v:
Radio Science. 29:167-194
A mechanism for the formation of polar cap patches is proposed based on data collected by the Sondrestrom incoherent scatter radar, magnetometers located on the west and east coasts of Greenland and Digisondes, digital ionospheric sounders, operated
Autor:
C. Bridgwood, Ronald G. Caton, Charles S. Carrano, Santimay Basu, John M. Retterer, Keith M. Groves
Publikováno v:
2011 XXXth URSI General Assembly and Scientific Symposium.
The Communication/Navigation Outage Forecast System (C/NOFS) satellite was launched in April 2008 for the purpose of specifying and forecasting equatorial ionospheric scintillation. For the first two years on orbit the satellite operated in a period