On 11‐cm irregularities during equatorial spread <i>F</i>

Huba, J. D.; Ossakow, S. L.

doi:10.1029/ja086ia02p00829

Cited by 58 publications

(36 citation statements)

References 11 publications

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“…As seen in Figure 1 and described by Tsunoda and White (1980),11 the same data set used here corresponded to a time during which ESF backscatter was in its growth phase (Tsunoda, are spatially collocated with plasma bubbles--i.e., local depletions in F-region plasma density. This spatial collocation is consistent with the hypothesis that the lower-hybrid-drift (LHD) instability is the source mechanism for these small-scale, field-aligned irregularities (Huba et al, 1978;Sperling and Goldman, 1980;Huba and Ossakow, 1981).…”

Section: Discussionsupporting

confidence: 73%

ALTAIR Radar Study of Equatorial Spread F.

Tsunoda¹

1981

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Section: Discussionsupporting

confidence: 73%

ALTAIR Radar Study of Equatorial Spread F.

Tsunoda¹

1981

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“…This preference for low plasma densities is consistent with the production of these irregularities by the lower-hybrid-drift (LHD) instability [Huba et al, 1978;S §Terlinjnd Goldman, 1980;Huba and Ossakow, 1981]. For a given gradient scale length in plasma density (associated with the walls of bubbles or with larger-scale irregularities embedded in the bubbles), the growth rate of this instability increases with decreasing plasma density.…”

Section: Discussionmentioning

confidence: 55%

Equatorial plasma bubbles: Vertically elongated wedges from the bottomside F layer

Tsunoda¹,

Livingston²,

McClure³

et al. 1982

J. Geophys. Res.

227

166

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We address the question regarding the two‐dimensional shape of equatorial plasma bubbles in the plane transverse to the geomagnetic field. By comparing the east‐west spatial relationship of ion‐density depletions measured in‐situ by the Atmospheric Explorer E (AE‐E) satellite to backscatter plumes measured by the ALTAIR radar, we show that plasma bubbles are vertically elongated depletions that extend upward from the bottom side of the F layer, in the form of tilted wedges, rather than more isotropically shaped but isolated structures. The shape of plasma bubbles is inferred from (1) ion density depletions that exceeded 99% in the ‘neck’ regions of plumes and (2) the eastward drift velocities of the plumes. The expected electrodynamics of vertically elongated plasma bubbles are consistent with the observations of large eastward drift velocities of plumes that are comparable to F region plasma drift measurements made at Jicamarca and to F region neutral wind measurements made at Kwajalein. The results also reveal that the west wall of large‐scale altitude modulations of the bottomside F layer that produces the primary plumes and bubbles becomes structured, and evolves with the generation of secondary plumes and bubbles.

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“…Drift waves [ Chen , 1974] have been proposed as a possible explanation for small‐scale waves and for anomalous diffusion [ LaBelle et al , 1986], even though it has long been recognized that drift waves are linearly stable [ Huba and Ossakow , 1981a, 1981b] in most space plasmas. A recent study seems once again to verify this result [ Kelley et al , 2002] and the authors feel this explanation has been ruled out.…”

Section: Discussionmentioning

confidence: 99%

Barium cloud striations revisited

Kelley

2003

J. Geophys. Res.

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[1] Rocket-based barium cloud striation observations from the 1970s are revisited based on a better knowledge of naturally occurring irregularities and on a previously unpublished analysis. A sharp drop in the spectral density of the plasma density fluctuation power is found near 25 m wavelength. This mimics equatorial spread F (ESF) spectra reported in the 1990s. Structure balance arguments show that the effective perpendicular ambipolar diffusion coefficient is 25 times the classical value, in good agreement with the natural case. We speculate that three-wave coupling occurs to small scales where damped modes provide this anomalous diffusion effect, which is one-tenth the value of the Bohm diffusion.

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On 11‐cm irregularities during equatorial spread F

Cited by 58 publications

References 11 publications

ALTAIR Radar Study of Equatorial Spread F.

ALTAIR Radar Study of Equatorial Spread F.

Equatorial plasma bubbles: Vertically elongated wedges from the bottomside F layer

Barium cloud striations revisited

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