Statistical relationships between high‐latitude ionospheric <i>F</i> region/topside upflows and their drivers: DE 2 observations

Seo, Yoonho; Horwitz, J. L.; Caton, R. G.

doi:10.1029/97ja00151

Cited by 61 publications

(84 citation statements)

References 16 publications

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“…Zheng et al [2005] found in a statistical survey of POLAR satellite data that outflowing ions were correlated with soft electron precipitation and to a slightly lesser degree, downward directed Poynting flux. The former finding is in agreement with Seo et al [1997] who identified the anticorrelation of precipitating electron energy and ion up flux at low DE-2 satellite (850 -950 km) altitudes. Ogawa et al [2003] used DMSP and EISCAT to show that soft precipitation primarily drives ion upflow.…”

Section: Introductionsupporting

confidence: 81%

SERSIO: Svalbard EISCAT Rocket Study of Ion Outflows

et al. 2007

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[1] The SERSIO sounding rocket was launched from Ny-Alesund, Svalbard, into a type 2 ion upflow event simultaneously observed by the European Incoherent Scatter (EISCAT) radar facility in Longyearbyen on 22 January 2004 at 0857 UT. It reached an apogee of 782 km. In situ wave data and thermal particle measurements in the cusp/cleft region clearly show core thermal ion temperature enhancements up to 0.8 eV in association with 0-4 kHz broadband extremely low frequency wave activity (BBELF). The in situ observation of wave heating in the cusp/cleft region at these low altitudes (520-780 km) and high densities (80,000/cm 3 ) is an important measurement and should be included in any model of ion energization. Wave activity in the form of naturally enhanced ion acoustic lines (NEIAL) was seen by the EISCAT radar in the same activity region. Periods of NEIAL were compared with in situ auroral electron data that show no evidence of a bump-on-tail distribution; thus our data do not support using Langmuir turbulence to explain these radar echoes. In contrast, these observations associating NEIAL with BBELF activity suggest that they may be the same phenomenon. During these comparisons, all-sky camera images were used to verify similar environmental conditions between the rocket and radar measurement volumes, while the spatial separation between the volumes was less than 500 km. In situ measurements also confirm the link between soft electron precipitation and thermal electron temperature enhancements in this ion upflow environment.

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Section: Introductionsupporting

confidence: 81%

SERSIO: Svalbard EISCAT Rocket Study of Ion Outflows

et al. 2007

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“…Seo et al [1997] also found that for nearly constant precipitation energy flux for electrons of < 1 keV energies, the ion upflow velocities and fluxes increased as the characteristic precipitation energies decreased. They suggested that soft electron precipitation was probably the primary driver of these auroral ion upflows.…”

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confidence: 88%

Statistical analysis of F region and topside ionospheric ion field‐aligned flows at high latitudes

Wu¹,

Horwitz²,

Seo³

2000

J. Geophys. Res.

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“…The effects of •oft electron precipitation on F region/topside upflows were investigated with fluid modeling [Richards, 1995;Suet al, 1999] and semi-kinetic modeling [Brown et al, 1995a]. Satellite measurements [Seo et al, 1997] [Hedin, 1991] or international reference ionosphere-90 (IRI-90) hmF2-derived neutral wind models [Richards, 1991] To join the fluid and GSK treatments and regions, the injected GSK simulation ions are introduced into the bottom cell of the kinetic region, as generated from a drifting Maxwellian distribution constructed from the ion bulk parameters of densities, bulk field-aligned flow velocities, and temperatures at 800 km in the fluid region. In the following time step, the bulk parameters calculated from various moments at the 1100 km cell of the kinetic region and their gradients are passed back as the upper boundary condition to the fluid region.…”

Section: Paper Number 1999ja900114mentioning

confidence: 99%

Dynamic fluid‐kinetic (DyFK) modeling of auroral plasma outflow driven by soft electron precipitation and transverse ion heating

Wu¹,

Horwitz²,

Estep³

et al. 1999

J. Geophys. Res.

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Abstract. We apply a recently developed dynamic fluid-kinetic (DyFK) model to simulate and investigate the effects of soft auroral electron precipitation and perpendicular ion heating by waves on the plasma outflow along auroral field lines. The DyFK model is constructed by coupling a fluid ionospheric model for the region from 120 to 800 km to a semikinetic treatment for topside through several RE altitude region. This approach, which is described in detail here, allows a partially self-consistent description of the plasma transport along highlatitude flux tubes where both low-altitude ionospheric heating and ionization production and loss as well as high-altitude energization and kinetic effects are incorporated and stressed. In the present work, we investigate the combined effects of the F region plasma production and electron heating by soft auroral electron precipitation and ion perpendicular wave heating at high altitudes, which produces ion conics. The auroral event simulated here involves 1.5 hours of moderate soft electron precipitation and relatively weak ion cyclotron waves along the magnetic field lines. The simulations reveal the F region electron heating and ionization

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Statistical relationships between high‐latitude ionospheric F region/topside upflows and their drivers: DE 2 observations

Cited by 61 publications

References 16 publications

SERSIO: Svalbard EISCAT Rocket Study of Ion Outflows

SERSIO: Svalbard EISCAT Rocket Study of Ion Outflows

Statistical analysis of F region and topside ionospheric ion field‐aligned flows at high latitudes

Dynamic fluid‐kinetic (DyFK) modeling of auroral plasma outflow driven by soft electron precipitation and transverse ion heating

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