Signatures of 2-day wave in the E-region electric fields and their relationship to winds and ionospheric currents

Aveiro, H. C.; Denardini, Clezio Marcos; Abdu, M. A.

doi:10.5194/angeo-27-631-2009

Cited by 12 publications

(14 citation statements)

References 33 publications

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“…This wavelike current system produces perturbations in the geomagnetic field that are easily measured at ground level. Then, the day-to-day variability in the ionospheric currents detected by ground-based magnetometer measurements particularly during magnetically quiet conditions, could be due to penetration of planetary waves or modulated tides into the dynamo region (Gurubaran et al, 2001;Pancheva et al, 2006Pancheva et al, , 2008Aveiro et al, 2009;Ramkumar et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Forcing of the ionosphere from above and below during the Arctic winter of 2005/2006

Mukhtarov

Andonov

Borries³

et al. 2010

Journal of Atmospheric and Solar-Terrestrial Physics

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Section: Introductionmentioning

confidence: 99%

Forcing of the ionosphere from above and below during the Arctic winter of 2005/2006

Mukhtarov

Andonov

Borries³

et al. 2010

Journal of Atmospheric and Solar-Terrestrial Physics

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“…These perturbations appear to be strongest during SSW events Pancheva et al [2006]. studied in detail the global occurrence of 2 day wave activity during this period, andAveiro et al [2009] reported their signatures on the equatorial electrojet and E region electric fields in the Brazilian sector.…”

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confidence: 99%

Lunar‐dependent equatorial ionospheric electrodynamic effects during sudden stratospheric warmings

et al. 2010

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[1] We have used plasma drift and magnetic field measurements during the [2001][2002][2003][2004][2005][2006][2007][2008][2009] December solstices to study, for the first time, the longitudinal dependence of equatorial ionospheric electrodynamic perturbations during sudden stratospheric warmings. Jicamarca radar measurements during these events show large dayside downward drift (westward electric field) perturbations followed by large morning upward and afternoon downward drifts that systematically shift to later local times. Ground-based magnetometer measurements in the American, Indian, and Pacific equatorial regions show strongly enhanced electrojet currents in the morning sector and large reversed currents (i.e., counterelectrojets) in the afternoon sector with onsets near new and full moons during northern winter warming periods. CHAMP satellite and ground-based magnetic field observations indicate that the onset of these equatorial afternoon counterelectrojets is longitude dependent. Our results indicate that these large electrodynamic perturbations during stratospheric warming periods are due to strongly enhanced semidiurnal lunar wave effects. The results of our study can be used for forecasting the occurrence and evolution of these electrodynamic perturbations during arctic winter warmings.Citation: Fejer, B. G., M. E. Olson, J. L. Chau, C. Stolle, H. Lühr, L. P. Goncharenko, K. Yumoto, and T. Nagatsuma (2010), Lunar-dependent equatorial ionospheric electrodynamic effects during sudden stratospheric warmings,

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“…Finally, the phase velocity estimates for Type II irregularities ( V pII , in m/s), which were obtained by the fitting procedure, are used to calculate the vertical electric field ( E z ), as given by: where ϕ is the beam zenith angle (30° eastward), H is the horizontal component of the magnetic flux density B , and B is defined as ∣ B ∣. For a more complete explanation about the E z computation, see Aveiro et al [2009].…”

Section: Experiments and Data Analysis Techniquementioning

confidence: 99%

“…where f is the beam zenith angle (30°eastward), H is the horizontal component of the magnetic flux density B, and B is defined as jBj. For a more complete explanation about the E z computation, see Aveiro et al [2009].…”

Section: Experiments and Data Analysis Techniquementioning

confidence: 99%

Climatology of gravity waves–induced electric fields in the equatorial E region

2009

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[1] Equatorial electrojet (EEJ) observations using VHF radars show backscattered echoes from two types of electron density irregularities explained by the modified two-stream (Type I) and the gradient drift (Type II) instabilities. From the Type II irregularity velocities obtained by a radar installed at São Luiz Space Observatory (2.58°S, 44.23°W, magnetic latitude 0.23°S) we have inferred the vertical electric fields (E z ). The E z inference was based on geomagnetic field and atmospheric models. A harmonic analysis of these electric fields shows the presence of gravity waves (GW) induced oscillations in the EEJ. We calculated the ratio between GW-related electric fields and the total E z , which is an indicator of the efficiency in the production of an additional electric field due to a gravity wave neutral wind. In the present paper we describe the methodology of analysis and discuss some characteristics of the gravity waves that could modify the equatorial ionospheric electric fields.

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Signatures of 2-day wave in the E-region electric fields and their relationship to winds and ionospheric currents

Cited by 12 publications

References 33 publications

Forcing of the ionosphere from above and below during the Arctic winter of 2005/2006

Forcing of the ionosphere from above and below during the Arctic winter of 2005/2006

Lunar‐dependent equatorial ionospheric electrodynamic effects during sudden stratospheric warmings

Climatology of gravity waves–induced electric fields in the equatorial E region

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