Location of Repository

An analysis of pump-induced artificial ionospheric ion upwelling at EISCAT

By M.J. Kosch, Y. Ogawa, M.T. Rietveld, S. Nozawa and R. Fujii

Abstract

Ion outflow from the high-latitude ionosphere is a well-known phenomenon and an important source of plasma for the magnetosphere. It is also well known that pumping the ionosphere with high-power high-frequency radio waves causes electron heating. On a few occasions, this has been accompanied by artificially induced ion upwelling. We analyze such a controlled experiment at EISCAT up to 600 km altitude. The pump-enhanced electron temperatures reached up to ∼4000 K above 350 km, and ion upwelling reached up to ∼300 m/s above 500 km altitude. The pump-induced electron pressure gradient can explain the ion velocity below 450 km. Between 450 and 600 km the electron pressure gradient correlates equally with ion acceleration and ion velocity, which represents the transition altitude to free ion acceleration. The electron gas pressure gradient can explain ion upwelling, at least up to 600 km altitude. In addition, such active experiments open the possibility to estimating the F layer ion-neutral collision frequency and neutral density with altitude from ground-based observations

Year: 2010
DOI identifier: 10.1029/2010JA015854
OAI identifier: oai:eprints.lancs.ac.uk:35539
Provided by: Lancaster E-Prints

Suggested articles

Preview

Citations

  1. (1991). The combined effect of solar and geomagnetic activity onhigh‐latitude thermosphericwinds: Part I.Observations,
  2. (2005a), Phenomena in the ionosphere‐ magnetosphere system induced by injection of powerful HF radio waves into nightside auroral ionosphere, doi
  3. (2005b), Heater‐induced phenomena in a coupled ionosphere‐magnetosphere system, doi
  4. (1999). Naturally enhanced ion acoustic lines seen with the EISCAT Svalbard radar, doi
  5. (2004). Observations of diverging field‐aligned ion flow with the ESR, doi
  6. (1995). Analysis of Lyman a and He I 584‐A airglow measurements using a spherical radiative transfer model, doi
  7. (1996). Modeling of F region ionospheric upflows observed by EISCAT, doi
  8. (1988). The terrestrial plasma source: A new perspective in solar‐terrestrial process from Dynamic explorer, doi
  9. (2000). Ion‐Neutral Coupling in the high‐latitude F layer from incoherent scatter and Fabry‐Perot interferometer measurements, doi
  10. (1991). EISCAT radar observation of enhanced incoherent scatter spectra and their relation to red aurora and field‐aligned currents, doi
  11. (1979). Diffusion and heat flow equations with allowance for large temperature differences between interacting spec i e s , doi
  12. (2004). The first one hundred milliseconds of HF modification at Tromsø, doi
  13. (1999). Enhanced ion acoustic fluctuations and ion outflows, doi
  14. (1998). A statistical study of diurnal, seasonal and solar cycle variations of F region and topside auroral upflows observed by EISCAT between doi
  15. (2007). SERSIO: Svalbard EISCAT rocket study of ion outflows, doi
  16. (2006). Electron gyroharmonic effects in ionization and electron acceleration during HF pumping in the ionosphere, doi
  17. (1991). Extension of the MSIS thermospheric model into the middle and lower atmosphere, doi
  18. (1999). First direct observations of the reduced striations at pump frequencies close to the electron gyroharmonics, doi
  19. (1997). Four contemporary issues concerning ionospheric plasma flow to the magnetosphere, Space Sci. doi
  20. (1988). large plasma velocities along the magnetic field line in the auroral zone, doi
  21. (1990). A statistical study of large field‐aligned flows of thermal ions at high‐latitudes, doi
  22. (2005). Artificial optical emissions at HAARP for pump frequencies near the third and second gyroharmonic, doi
  23. (2000). ESR and EISCAT observations of the response of the cusp and cleft to IMF orientation changes, doi
  24. (2008). Formation of artificial ionospheric ducts, doi
  25. (2010). Model for artificial ionospheric duct formation due to HF heating, doi
  26. (1999). Source processes in the high‐latitude ionosphere, doi
  27. (1998). A case‐study of the low‐latitude thermosphere during geomagnetic storms and its new representation by improved MSIS model, doi
  28. (2002). Generation mechanisms of ion upflow in the polar topside ionosphere,
  29. (2000). Simultaneous EISCAT Svalbard and VHF radar observations of ion upflows at different aspect angles, doi
  30. (2003). Simultaneous EISCAT Svalbard radar and DMSP observations of the ion upflow in the dayside polar ionosphere, doi
  31. (2006). Naturally enhanced ion‐acoustic lines at high altitudes, doi
  32. (2008). Coordinated EISCAT Svalbard radar and Reimei satellite observations of ion upflows and suprathermal ions, doi
  33. (2009). On the source of the polar wind in the polar topside ionosphere: First results from the EISCAT Svalbard radar, doi
  34. (2010). Solar activity dependence of ion upflow in the polar ionosphere observed with the EISCAT Tromsø UHF radar, doi
  35. (1991). Naturally enhanced ion acoustic waves in the auroral ionosphere observed with the EISCAT 933‐MHz radar, doi
  36. (1993). Introduction to Ionospheric heating at Tromso I—Experimental overview, doi
  37. (2000). Measurements of HF‐enhanced plasma and ion lines at EISCAT with high altitude resolution, doi
  38. (2003). Ionospheric electron heating, optical emissions and striations induced by powerful HF radio waves at high latitudes: Aspect angle dependence, doi
  39. (1993). EISCAT: Early history and the first ten years of operation, doi
  40. (1989). The heating of the high latitude ionosphere by high power radio waves, doi
  41. (1996). First EISCAT observations of the modification of F region electron temperatures during RF heating at harmonics of the electron gyro frequency, doi
  42. (1975). Transport equations for aeronomy, doi
  43. (2000). Ionospheres: Physics, Plasma Physics, and Chemistry, doi
  44. (1997). Statistical relationships between high‐latitude ionospheric F region/topside upflows and their drivers: doi
  45. (1999). Systematic modeling of soft‐electron precipitation effects on high‐latitude F region and topside ionospheric upflows, doi
  46. (2002). Correction to daytime mesospheric atomic oxygen density in MSIS‐90 obtained from WINDII measurements of O(1S) dayglow emissions,
  47. (1989). EISCAT observations of strong ion outflows from the F region ionosphere during auroral activity: Preliminary results, doi
  48. (1992). EISCAT observations of strong ion outflows from the F region ionosphere during auroral activity: Revisited, doi
  49. (1993). Electron energisation in the topside auroral ionosphere: The importance of ion‐acoustic turbulence, doi
  50. (1988). Large field‐aligned velocities observed by EISCAT, doi
  51. (1989). Observations of large field‐aligned flows of thermal plasma in the auroral ionosphere, doi
  52. (1997). Sources of ion outflow in the high latitude ionosphere, Space Sci. doi
  53. (1991). The combined effect of solar and geomagnetic activityonhigh‐latitudethermosphericwinds:PartI.Observations,J.Atmos.
  54. (1979). Diffusion and heat flow equations with allowance for large temperature differences between interacting species, doi
  55. (1997). Four contemporary issues concerning ionospheric plasma flow to the magnetosphere, doi
  56. (1993),Introduction to Ionospheric heatingat Tromso I—Experimental overview,

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.