Conjugate Sporadic-E measurements

MacDougall, J. W.; Abdu, M. A.; Batista, I. S.

doi:10.1016/j.jastp.2009.05.009

Cited by 5 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The COPEX campaign combined the efforts of many scientific groups (e.g., National Institute for Space Research/INPE, Brazil; Air Force Research Laboratory, USA; University of Massachusetts Lowel; Brazilian Air Force; and others), and the data collected during the observation period were used to validate the Communication/Navigation Outage Forecasting System (C/NOFS) satellite [ de La Beaujardière et al , 2004] prior to its launching in April 2008. The scientific objectives of the COPEX campaign and other relevant results published elsewhere using different instruments and techniques can be found in the work of Abdu et al [2009], McDougall et al [2009], Sobral et al [2009], Batista et al [2008], McNamara et al [2008], Muella et al [2008b], and Reinisch et al [2004].…”

Section: Introductionmentioning

confidence: 99%

Magnetic conjugate point observations of kilometer and hundred‐meter scale irregularities and zonal drifts

et al. 2010

View full text Add to dashboard Cite

[1] The Conjugate Point Equatorial Experiment (COPEX) campaign was carried out in Brazil, between October and December 2002, to study the conjugate nature of plasma bubble irregularities and to investigate their generation mechanisms, development characteristics, spatial-temporal distribution, and dynamics. In this work we will focus mainly on the zonal spaced GPS (1.575 GHz) and VHF (250 MHz) receivers' data collected simultaneously at two magnetic conjugate sites of the COPEX geometry: Boa Vista and Campo Grande. These GPS/VHF receivers were set up to detect the equatorial scintillations and to measure ionospheric scintillation pattern velocities. Then, the zonal irregularity drift velocities were estimated by applying a methodology that corrects the effects caused by vertical drifts and geometrical factors. The results reveal the coexistence of kilometer-(VHF) and hundred-meter-scale (GPS L-band) irregularities into the underlying depletion structure. Over the conjugate site of Campo Grande, the average zonal velocity at VHF seems to be consistently larger than the estimated GPS velocities until ∼0200 UT, whereas over Boa Vista the irregularities detected from both techniques are drifting with comparable velocities. The hundred-meter-scale structures causing L-band scintillations appear to be drifting with comparable velocities over both the conjugate sites, whereas the kilometer-scale structures are drifting over Campo Grande with larger average velocities (before 0300 UT). Complementary data of ionospheric parameters scaled from collocated digital ionosondes are used in the analysis to explain differences/similarities on the scintillation/zonal drift results.

show abstract

Section: Introductionmentioning

confidence: 99%

Magnetic conjugate point observations of kilometer and hundred‐meter scale irregularities and zonal drifts

et al. 2010

View full text Add to dashboard Cite

show abstract

“…The COPEX campaign was conducted from October to December 2002 (Reinisch et al, 2004;Batista et al, 2008;McNamara et al, 2008;Abdu et al, 2009b;MacDougall et al, 2009;Sobral et al, 2009;de Paula et al, 2010). At geomagnetically conjugate stations, Boa Vista and Campo Grande (20:50 3 S; 54:70 3 W, dip angle 21:0 3 S), airglow imagers were installed.…”

Section: Observations and Instrumentationmentioning

confidence: 99%

Mesospheric gravity waves and ionospheric plasma bubbles observed during the COPEX campaign

Paulino

Takahashi

Medeiros

et al. 2011

Journal of Atmospheric and Solar-Terrestrial Physics

View full text Add to dashboard Cite

“…A more sophisticated picture of the ionospheric E-and F 2 -region parameters has been obtained in special nearequatorial empirical conjugate studies in Brazil (McNamara et al, 2008;MacDougall et al, 2009). Considerations of the ambient conditions at the conjugate locations indicate that relatively small differences in parameters such as tidal winds, electric fields, and background density gradients can significantly affect the structuring of the E s layer.…”

Section: Introductionmentioning

confidence: 99%

Inter-hemispheric imaging of the ionosphere with the upgraded IRI-Plas model during the space weather storms

2011

View full text Add to dashboard Cite

International Reference Ionosphere extended to the plasmasphere (IRI-Plas) is upgraded analytically for assimilative mode of operation using GPS-derived Total Electron Content (TEC) for reconstruction of instantaneous ionospheric critical frequency and topside scale height at magnetic conjugate hemisphere. The performance of IRI-Plas code is examined with TEC gps retrieved from Global Ionospheric Maps compared with the F 2 -layer critical frequency at eight ionosonde locations in East Asia region on both hemispheres during the space weather storms at solar maximum (2000) and solar minimum (2006). Missing ionosonde data are completed by cloning of critical frequency. Decomposition of TEC gps in electron density profile with IRI-Plas code reveals the opposite relative changes of critical frequency and the topside scale height depending on solar activity. The ionospheric weather W index is computed for the desired locations in conjugate hemispheres and consistent results are obtained indicating the departure of instantaneous values of ionospheric parameters from their respective median varying from quiet state to intense storm.

show abstract

Conjugate Sporadic-E measurements

Cited by 5 publications

References 23 publications

Magnetic conjugate point observations of kilometer and hundred‐meter scale irregularities and zonal drifts

Magnetic conjugate point observations of kilometer and hundred‐meter scale irregularities and zonal drifts

Mesospheric gravity waves and ionospheric plasma bubbles observed during the COPEX campaign

Inter-hemispheric imaging of the ionosphere with the upgraded IRI-Plas model during the space weather storms

Contact Info

Product

Resources

About