Accession Number : ADA227899


Title :   Storm Induced Changes of the Topside Ionosphere as Deduced from Incoherent Scatter Radars


Descriptive Note : Master's thesis,


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH


Personal Author(s) : Lunn, Kevin J.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA227899


Report Date : 1990


Pagination or Media Count : 110


Abstract : Incoherent scatter radar observations from Millstone Hill, Saint Santin, and Arecibo are used to illustrate changes of the topside ionosphere during a geomagnetic storm. These observations consist of electron density, electron and ion temperatures, and ion velocity components parallel and perpendicular to the magnetic field. These parameters can further describe changes in ion composition, electric fields, and neutral winds. Attention is given to a specific storm during the Equinox Transition Study (ETS) of September 1984. In order to isolate the storm effects in the topside ionosphere, a comparison will be made between a disturbed and quiet day. A novel result from this study is the finding of correlated oscillations between parallel and perpendicular ion velocity components which are apparently storm induced. Previously, these oscillations have been observed primarily at night, but now it's noticed that during storm conditions there are prominent oscillations during the day. (JHD)


Descriptors :   *RADAR REFLECTIONS , *MAGNETIC STORMS , TEMPERATURE , MAGNETIC FIELDS , NEUTRAL , ELECTRON DENSITY , WIND , THESES , ELECTRIC FIELDS , ELECTROMAGNETIC SCATTERING , CHEMICAL COMPOSITION , INCOHERENCE , ELECTRONS , DAY , NIGHT , PARALLEL ORIENTATION , INCOHERENT SCATTERING , OSCILLATION , QUIET , IONS , GEOMAGNETISM , IONOSPHERE


Subject Categories : ATMOSPHERIC PHYSICS
      RADIOFREQUENCY WAVE PROPAGATION


Distribution Statement : APPROVED FOR PUBLIC RELEASE