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

Wu, X.‐Y.; Horwitz, J. L.; Seo, Yoonho

doi:10.1029/1999ja900437

Cited by 16 publications

(18 citation statements)

References 40 publications

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“…The profiles of concentration of ions and electrons, obtained in our calculations, are in a good agreement with the modeling and experimental profiles shown by Schunk (2000), Wu et al (2000) and Truhlik et al (2005).…”

Section: Calculation Results and Discussionsupporting

confidence: 85%

“…The latitudinal dependences of electron and ion temperatures at heights of F-region and an external ionosphere also attracted attention of many researchers (Bailey et al, 2000;Wu et al, 2000). The latitudinal profile of T i at height of 300 km is close to the latitudinal profile of the neutral temperature, T n , at the same height.…”

Section: Article In Pressmentioning

confidence: 95%

“…It is caused by the disappearance of the source of electron heating by photoelectrons, by the presence of the source of Joule ion heating and by the fact that ion heat conductivity is considerably smaller then electron one. Bailey et al (2000), Wu et al (2000) marked the cases when the values of T e were smaller, than T i . At station Jicamarca the night vertical profiles of T e and T i practically coincide .…”

Section: Article In Pressmentioning

confidence: 97%

“…The thermal balance of the F2-region and the external ionosphere was investigated in the ground-based, rocket and satellite experiments, and also theoretically (e.g., Bailey et al, 2000;Wu et al, 2000;Venkatraman et al, 2000). The hot zones in the ion and electron temperatures have been discovered at subauroral latitudes at dawn and pre-midnight sectors of local time (e.g., Schunk and Sojka, 1982;Mingaleva and Mingalev, 1996;Klimenko et al, 1992).…”

Section: Introductionmentioning

confidence: 98%

“…9 and 10 are obtained while the preset of the field aligned currents of the first zone. The latitudinal dependences of electron concentration at heights of $300 km were investigated byWu et al (2000),Yizengaw and Moldwin (2005), and the latitudinal dependences of concentration of electrons and H + ions at heights of $800-1000 km were investigated byTaylor and Walsh (1972) andYizengaw and Moldwin (2005). The global distributions of the temperature of electrons in an external ionosphere of the Earth at height of 1500 km calculated in the model GSM TIP in the Cartesian geomagnetic coordinate system (longitude-latitude) at 00 UT.…”

mentioning

confidence: 99%

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Numerical modeling of the light ion trough and heat balance of the topside ionosphere in quiet geomagnetic conditions

Клименко

Клименко²,

Bryukhanov

2008

Journal of Atmospheric and Solar-Terrestrial Physics

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Section: Calculation Results and Discussionsupporting

confidence: 85%

Section: Article In Pressmentioning

confidence: 95%

Section: Article In Pressmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

mentioning

confidence: 99%

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Numerical modeling of the light ion trough and heat balance of the topside ionosphere in quiet geomagnetic conditions

Клименко

Клименко²,

Bryukhanov

2008

Journal of Atmospheric and Solar-Terrestrial Physics

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Measuring the seeds of ion outflow: Auroral sounding rocket observations of low‐altitude ion heating and circulation

et al. 2016

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We present an analysis of in situ measurements from the MICA (Magnetosphere‐Ionosphere Coupling in the Alfvén Resonator) nightside auroral sounding rocket with comparisons to a multifluid ionospheric model. MICA made observations at altitudes below 325 km of the thermal ion kinetic particle distributions that are the origins of ion outflow. Late flight, in the vicinity of an auroral arc, we observe frictional processes controlling the ion temperature. Upflow of these cold ions is attributed to either the ambipolar field resulting from the heated electrons or possibly to ion‐neutral collisions. We measure trueE→×trueB→ convection away from the arc (poleward) and downflows of hundreds of m s−1 poleward of this arc, indicating small‐scale low‐altitude plasma circulation. In the early flight we observe DC electromagnetic Poynting flux and associated ELF wave activity influencing the thermal ion temperature in regions of Alfvénic aurora. We observe enhanced, anisotropic ion temperatures which we conjecture are caused by transverse heating by wave‐particle interactions (WPI) even at these low altitudes. Throughout this region we observe several hundred m s−1 upflow of the bulk thermal ions colocated with WPI; however, the mirror force is negligible at these low energies; thus, the upflow is attributed to ambipolar fields (or possibly neutral upwelling drivers). The low‐altitude MICA observations serve to inform future ionospheric modeling and simulations of (a) the need to consider the effects of heating by WPI at altitudes lower than previously considered viable and (b) the occurrence of structured and localized upflows/downflows below where higher‐altitude heating rocesses are expected.

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Average field‐aligned ion velocity over the EISCAT radars

2017

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Long‐term measurements by the European Incoherent Scatter (EISCAT) radars at Tromsø (69.6°N, 19.2°E) and Svalbard (78.2°N, 16.0°E) are used to determine the climatology of the field‐aligned ion velocity in the F region ionosphere (175–475 km) at high latitudes. The average ion velocity is calculated at various altitudes and times of day. The magnitude of the average field‐aligned ion velocity is on the order of 10 m/s, similar to previous results at middle and low latitudes. The results obtained for the two radars are in good agreement. During daytime the direction of the average field‐aligned ion velocity changes from downward to upward around 350 km, while during nighttime it is upward at all heights. The reversal height of the daytime field‐aligned ion velocity depends on solar activity. It is elevated by more than 100 km during high solar flux periods compared to low solar flux periods. The Thermosphere Ionosphere Electrodynamics General Circulation Model reproduces the main features of the field‐aligned ion velocity climatology. The simulation results suggest that the plasma pressure gradient force and gravity force play a dominant role for the daytime field‐aligned ion motion. The height pattern of the field‐aligned ion velocity tends to be preserved in different solar activity conditions at constant pressure surfaces, but not at constant altitudes, which explains the observed dependence on solar activity. During nighttime, the effect of the neutral wind dominates the field‐aligned ion velocity.

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

Cited by 16 publications

References 40 publications

Numerical modeling of the light ion trough and heat balance of the topside ionosphere in quiet geomagnetic conditions

Numerical modeling of the light ion trough and heat balance of the topside ionosphere in quiet geomagnetic conditions

Measuring the seeds of ion outflow: Auroral sounding rocket observations of low‐altitude ion heating and circulation

Average field‐aligned ion velocity over the EISCAT radars

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