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Akademický článek

On the Role of Mild Substorms and Enhanced Hall Conductivity in the Plasma Irregularities Onset and Zonal Drift Reversals: Experimental Evidence at Distinct Longitudes Over South America

Autor: J. Sousasantos, F. S. Rodrigues, B. G. Fejer, M. A. Abdu, A. A. Massoud, C. E. Valladares

Publikováno v: Earth and Space Science, Vol 10, Iss 11, Pp n/a-n/a (2023)

Abstract The 14‐panel Advanced Modular Incoherent Scatter Radar (AMISR‐14) system deployed at Jicamarca observed equatorial spread F plumes on two consecutive nights under unfavorable seasonal and solar flux conditions during a period that can be

Externí odkaz: https://doaj.org/article/da156924d50c4f4bad4a6e12cd2170e4

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Akademický článek

Features of highly structured equatorial plasma irregularities deduced from CHAMP observations

Autor: C. Xiong, H. Lühr, S. Y. Ma, C. Stolle, B. G. Fejer

Publikováno v: Annales Geophysicae, Vol 30, Pp 1259-1269 (2012)

In this study five years of CHAMP (Challenging Mini-satellite Payload) fluxgate magnetometer (FGM) data is used to investigate the characteristics of Equatorial Plasma Bubbles (EPBs). We filtered the FGM data by using band-passes with four differe

Externí odkaz: https://doaj.org/article/322b522e0fad420b828149fa9497d3eb

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Akademický článek

Duskside F-region dynamo currents: its relationship with prereversal enhancement of vertical plasma drift

Autor: J. Park, H. Lühr, B. G. Fejer, K. W. Min

Publikováno v: Annales Geophysicae, Vol 28, Pp 2097-2101 (2010)

From magnetic field observations by CHAMP we estimate F-region dynamo current densities near the sunset terminator during solar maximum years from 2001 to 2002. The dynamo currents are compared with the pre-reversal enhancement (PRE) of vertical p

Externí odkaz: https://doaj.org/article/f30374ca6b634d6ea8f721d0979e82ab

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Akademický článek

Overview and summary of the Spread F Experiment (SpreadFEx)

Publikováno v: Annales Geophysicae, Vol 27, Pp 2141-2155 (2009)

We provide here an overview of, and a summary of results arising from, an extensive experimental campaign (the Spread F Experiment, or SpreadFEx) performed from September to November 2005, with primary measurements in Brazil. The motivation was to

Externí odkaz: https://doaj.org/article/5f6cf043f16e44e9ad26fc562705fd0a

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Akademický článek

Relation between the occurrence rate of ESF and the equatorial vertical plasma drift velocity at sunset derived from global observations

Autor: C. Stolle, H. Lühr, B. G. Fejer

Publikováno v: Annales Geophysicae, Vol 26, Pp 3979-3988 (2008)

In this study, we investigate two global climatological data sets; the occurrence rate of Equatorial Spread-F (ESF), associated with equatorial plasma irregularities, at ~400 km altitude obtained from CHAMP observations, and the evening equator

Externí odkaz: https://doaj.org/article/eebeb11b918c4d3bb77fe3a5f177faed

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Akademický článek

Gravity wave and tidal influences on equatorial spread F based on observations during the Spread F Experiment (SpreadFEx)

Autor: D. C. Fritts, S. L. Vadas, D. M. Riggin, M. A. Abdu, I. S. Batista, H. Takahashi, A. Medeiros, F. Kamalabadi, H.-L. Liu, B. G. Fejer, M. J. Taylor

Publikováno v: Annales Geophysicae, Vol 26, Pp 3235-3252 (2008)

The Spread F Experiment, or SpreadFEx, was performed from September to November 2005 to define the potential role of neutral atmosphere dynamics, primarily gravity waves propagating upward from the lower atmosphere, in seeding equatorial spread F

Externí odkaz: https://doaj.org/article/239f61cfbac1465d8754f58c635c1346

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Akademický článek

Longitudinal dependence of middle and low latitude zonal plasma drifts measured by DE-2

Autor: J. W. Jensen, B. G. Fejer

Publikováno v: Annales Geophysicae, Vol 25, Pp 2551-2559 (2007)

We used ion drift observations from the DE-2 satellite to study for the first time the longitudinal variations of middle and low latitude F region zonal plasma drifts during quiet and disturbed conditions. The quiet-time middle latitude drifts are

Externí odkaz: https://doaj.org/article/2ae5d5ae05af4573988be25d66f3b8d2

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Akademický článek

Seasonal and magnetic activity variations of ionospheric electric fields above the southern mid-latitude station, Bundoora, Australia

Autor: M. L. Parkinson, R. Polglase, B. G. Fejer, L. Scherliess, P. L. Dyson, S. M. Ujmaia

Publikováno v: Annales Geophysicae, Vol 19, Pp 521-532 (2001)

We investigate the seasonal, local solar time, and geomagnetic activity variations of the average Doppler velocity measured by an HF digital ionosonde deployed at Bundoora, Australia (145.1° E, 37.7° S, geographic; 49° S magnetic). The Doppler

Externí odkaz: https://doaj.org/article/c7548de2e79d4ee4b2a8512eeae6b5ee

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