Ionospheric Plasma Bubbles Over South America: Scientific Studies And Evidences Of Their Interference In Telecommunications

2001 ◽  
Author(s):  
J.H.A. Sobral ◽  
M.A. Abdu ◽  
H. Takahashi ◽  
E.R. de Paula ◽  
I.S. Batista ◽  
...  
Keyword(s):  
South America ◽  
Ionospheric Plasma ◽  
Plasma Bubbles

scholarly journals ASSOCIATION BETWEEN IONOSPHERIC PLASMA BUBBLES AND SPREAD-F

2005 ◽  
Author(s):  
H. Castilho ◽  
Vivian Moreira ◽  
José Humberto Andrade; Abdu ◽  
Mangalathayil Ali; Arruda ◽  
Daniela Cristina
Keyword(s):  
Ionospheric Plasma ◽  
Plasma Bubbles ◽  
Spread F

CARACTERISTICS OF IONOSPHERIC PLASMA BUBBLES OBSERVED BY TEC MAPS IN BRAZILIAN SECTOR

2017 ◽  
Author(s):  
Diego Barros Silva ◽  
Hisao Takahashi ◽  
Cristiano Max Wrasse ◽  
Cosme Alexandre Oliveira Barros Figueireido
Keyword(s):  
Ionospheric Plasma ◽  
Plasma Bubbles

scholarly journals Simultaneous observation of ionospheric plasma bubbles and mesospheric gravity waves during the SpreadFEx Campaign

2009 ◽  
Vol 27 (4) ◽  
pp. 1477-1487 ◽  
Author(s):  
H. Takahashi ◽  
M. J. Taylor ◽  
P.-D. Pautet ◽  
A. F. Medeiros ◽  
D. Gobbi ◽  
...  
Keyword(s):  
Gravity Wave ◽  
Ionospheric Plasma ◽  
Bubble Formation ◽  
South American ◽  
Plasma Bubble ◽  
Simultaneous Observation ◽  
Plasma Bubbles ◽  
Spread F ◽  
The Relationship ◽  
Horizontal Wavelength

Abstract. During the Spread F Experiment campaign, under NASA Living with a Star (LWS) program, carried out in the South American Magnetic Equator region from 22 September to 8 November 2005, two airglow CCD imagers, located at Cariri (7.4° S, 36.5° W, geomag. 11° S) and near Brasilia (14.8° S, 47.6° W, geomag. 10° S) were operated simultaneously and measured the equatorial ionospheric bubbles and their time evolution by monitoring the airglow OI 6300 intensity depletions. Simultaneous observation of the mesospheric OH wave structures made it possible to investigate the relationship between the bubble formation in the ionosphere and the gravity wave activity at around 90 km. On the evening of 30 September 2005, comb-like OI 6300 depletions with a distance of ~130 km between the adjacent ones were observed. During the same period, a mesospheric gravity wave with a horizontal wavelength of ~130 km was observed. From the 17 nights of observation during the campaign period, there was a good correlation between the OI 6300 depletion distances and the gravity wave horizontal wavelengths in the mesosphere with a statistically significant level, suggesting a direct contribution of the mesospheric gravity wave to plasma bubble seeding in the equatorial ionosphere.

scholarly journals Spread-F characteristics at the southern anomaly crest in South America during the descending phase of solar cycle 24

2021 ◽  
Author(s):  
Gilda de Lourdes González
Keyword(s):  
Solar Activity ◽  
South America ◽  
Communication Systems ◽  
Temporal Distribution ◽  
Plasma Bubble ◽  
Night Time ◽  
Plasma Bubbles ◽  
Wide Range ◽  
Spread F ◽  
Range Spread

Abstract Ionospheric F-region irregularities can acutely affect navigation and communication systems. To develop predictive capabilities on their occurrence, it is key to understand their variabilities in a wide range of time scales. Previous studies at low latitudes in South America have been performed mostly for the eastern sector, and fewer efforts have been done in the Argentinian region. This work presents the analysis of the spread-F (range spread-F, frequency spread-F and strong spread-F) and plasma bubble occurrence characteristics near the southern crest of the Equatorial Ionization Anomaly (Tucumán, 26.8°S, 65.2°W; magnetic latitude 15.5°S). We used ionosonde and Global Positioning System (GPS) data from November 2014 to December 2019 for different solar and geomagnetic conditions. The data shows that spread-F and plasma bubble occurrence rates peak in summer and are minimum in equinox and winter, respectively. There is, usually, a negative correlation between each type of spread-F and solar activity, whereas the opposite happens for plasma bubbles. Geomagnetic activity suppresses the generation of spread-F in equinox and summer and enhances it in winter. Plasma bubble occurrence is higher during disturbed days than during quiet days, but under medium solar activity, summer months register more plasma bubbles in quiet conditions. Range spread-F observed in winter under low solar activity is not associated with plasma bubbles originated at the magnetic equator. These results contribute to the knowledge necessary to improve the prediction of the spatial and temporal distribution of the night-time ionospheric irregularities.

scholarly journals Ionospheric plasma bubbles observed concurrently by multi-instruments over low-latitude station Hainan

2015 ◽  
Vol 120 (3) ◽  
pp. 2288-2298 ◽  
Author(s):  
G. J. Wang ◽  
J. K. Shi ◽  
B. W. Reinisch ◽  
X. Wang ◽  
Z. Wang
Keyword(s):  
Ionospheric Plasma ◽  
Low Latitude ◽  
Plasma Bubbles ◽  
Latitude Station

Magnetic-flux-tube-integrated evolution of equatorial ionospheric plasma bubbles

1998 ◽  
Vol 103 (A3) ◽  
pp. 3957-3967 ◽  
Author(s):  
M. J. Keskinen ◽  
S. L. Ossakow ◽  
Santimay Basu ◽  
P. J. Sultan
Keyword(s):  
Magnetic Flux ◽  
Flux Tube ◽  
Ionospheric Plasma ◽  
Magnetic Flux Tube ◽  
Plasma Bubbles

scholarly journals Mapping and Survey of Plasma Bubbles over Brazilian Territory

2006 ◽  
Vol 60 (1) ◽  
pp. 69-81 ◽  
Author(s):  
L. F. C. de Rezende ◽  
E. R. de Paula ◽  
I. J. Kantor ◽  
P. M. Kintner
Keyword(s):  
Ionospheric Plasma ◽  
Signal Amplitude ◽  
Gps Receiver ◽  
Tropical Regions ◽  
Plasma Irregularities ◽  
Plasma Bubbles ◽  
Receiver Array ◽  
Field Lines ◽  
Using Data ◽  
The Impact

Ionospheric plasma irregularities or bubbles, that are regions with depleted density, are generated at the magnetic equator after sunset due to plasma instabilities, and as they move upward they map along the magnetic field lines to low latitudes. To analyse the temporal and spatial evolution of the bubbles over Brazilian territory, the mapping of ionospheric plasma bubbles for the night of 17/18 March 2002 was generated using data collected from one GPS receiver array, and applying interpolation techniques. The impact on the performance of Global Navigation Satellites System (GNSS) and on the Space Based Augmentation System (SBAS) in the tropical regions of the GPS signal losses of lock and of the signal amplitude fades during ionospheric irregularities is presented.

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