An Empirical Orthogonal Function (EOF) Analysis of Ionospheric Electron Density Profiles Based on the Observation of Incoherent Scatter Radar at Millstone Hill

2008 ◽  
Vol 51 (1) ◽  
pp. 12-19 ◽  
Author(s):  
Bing MEI ◽  
Wei-Xing WAN
Keyword(s):  
Electron Density ◽  
Empirical Orthogonal Function ◽  
Eof Analysis ◽  
Incoherent Scatter Radar ◽  
Ionospheric Electron Density ◽  
Density Profiles ◽  
Incoherent Scatter ◽  
Orthogonal Function ◽  
Scatter Radar ◽  
Electron Density Profiles

scholarly journals Variations of topside ionospheric scale heights over Millstone Hill during the 30-day incoherent scatter radar experiment

2007 ◽  
Vol 25 (9) ◽  
pp. 2019-2027 ◽  
Author(s):  
L. Liu ◽  
W. Wan ◽  
M.-L. Zhang ◽  
B. Ning ◽  
S.-R. Zhang ◽  
...  
Keyword(s):  
Electron Density ◽  
Thermal Structure ◽  
Plasma Temperature ◽  
Scale Height ◽  
Incoherent Scatter Radar ◽  
Density Profiles ◽  
Incoherent Scatter ◽  
Scatter Radar ◽  
Vertical Scale ◽  
Electron Density Profiles

Abstract. A 30-day incoherent scatter radar (ISR) experiment was conducted at Millstone Hill (288.5° E, 42.6° N) from 4 October to 4 November 2002. The altitude profiles of electron density Ne, ion and electron temperature (Ti and Te), and line-of-sight velocity during this experiment were processed to deduce the topside plasma scale height Hp, vertical scale height VSH, Chapman scale height Hm, ion velocity, and the relative altitude gradient of plasma temperature (dTp/dh)/Tp, as well as the F2 layer electron density (NmF2) and height (hmF2). These data are analyzed to explore the variations of the ionosphere over Millstone Hill under geomagnetically quiet and disturbed conditions. Results show that ionospheric parameters generally follow their median behavior under geomagnetically quiet conditions, while the main feature of the scale heights, as well as other parameters, deviated significantly from their median behaviors under disturbed conditions. The enhanced variability of ionospheric scale heights during the storm-times suggests that the geomagnetic activity has a major impact on the behavior of ionospheric scale heights, as well as the shape of the topside electron density profiles. Over Millstone Hill, the diurnal behaviors of the median VSH and Hm are very similar to each other and are not so tightly correlated with that of the plasma scale height Hp or the plasma temperature. The present study confirms the sensitivity of the ionospheric scale heights over Millstone Hill to thermal structure and dynamics. The values of VSH/Hp tend to decrease as (dTp/dh)/Tp becomes larger or the dynamic processes become enhanced.

scholarly journals Comparison of COSMIC occultation-based electron density profiles and TIP observations with Arecibo incoherent scatter radar data

Radio Science ◽  
2009 ◽  
Vol 44 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
M. C. Kelley ◽  
V. K. Wong ◽  
Nestor Aponte ◽  
Clayton Coker ◽  
A. J. Mannucci ◽  
...  
Keyword(s):  
Electron Density ◽  
Radar Data ◽  
Incoherent Scatter Radar ◽  
Density Profiles ◽  
Incoherent Scatter ◽  
Scatter Radar ◽  
Electron Density Profiles

scholarly journals A comparison of EISCAT and Dynasonde measurements of the auroral ionosphere

1996 ◽  
Vol 14 (12) ◽  
pp. 1403-1412 ◽  
Author(s):  
K. J. F. Sedgemore ◽  
P. J. S. Williams ◽  
G. O. L. Jones ◽  
J. W. Wright
Keyword(s):  
Auroral Ionosphere ◽  
Incoherent Scatter Radar ◽  
Density Profiles ◽  
Incoherent Scatter ◽  
Scatter Radar ◽  
Complementary Techniques ◽  
Electron Density Profiles ◽  
Ionospheric Sounding ◽  
Over Time ◽  
Good Agreement

Abstract. Incoherent-scatter radar and ionospheric sounding are powerful and complementary techniques in the study of the Earth's ionosphere. The work presented here involves the use of the Tromsø Dynasonde as a correlative diagnostic with the EISCAT incoherent-scatter radar. A comparison of electron-density profiles shows how a Dynasonde can be used to calibrate an incoherent-scatter radar and to monitor changes in the system. Skymaps of the direction of Dynasonde echoes are compared with EISCAT-derived density profiles to illustrate how a Dynasonde can be used to measure the drift velocity of auroral features. Vector velocities fitted to Dynasonde echoes are compared with EISCAT-derived plasma velocities. The results show good agreement when the data are taken during quiet to moderately active conditions and averaged over time scales of 30 min or more.

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