A statistical framework for space‐based EUV ionospheric tomography

Kamalabadi, F.; Karl, W.C.; Semeter, J. L.; Cotton, Daniel M.; Cook, Timothy A.; Chakrabarti, Supriya

doi:10.1029/1998rs900026

Cited by 41 publications

(38 citation statements)

References 18 publications

(6 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The descending node of each TIMED orbit provides two views of the plasma depletions having a component normal to the magnetic field from which tomographic retrievals of electron densities may be performed (Kamalabadi et al, 1999(Kamalabadi et al, , 2002Comberiate et al, 2007). The major assumption was that electron density fluctuations were approximately constant along magnetic field lines.…”

Section: Implications Of Plasma Measurements For Gw Parametersmentioning

confidence: 99%

Gravity wave and tidal influences on equatorial spread F based on observations during the Spread F Experiment (SpreadFEx)

et al. 2008

View full text Add to dashboard Cite

Abstract. The Spread F Experiment, or SpreadFEx, was performed from September to November 2005 to define the potential role of neutral atmosphere dynamics, primarily gravity waves propagating upward from the lower atmosphere, in seeding equatorial spread F (ESF) and plasma bubbles extending to higher altitudes. A description of the SpreadFEx campaign motivations, goals, instrumentation, and structure, and an overview of the results presented in this special issue, are provided by Fritts et al. (2008a). The various analyses of neutral atmosphere and ionosphere dynamics and structure described in this special issue provide enticing evidence of gravity waves arising from deep convection in plasma bubble seeding at the bottomside F layer. Our purpose here is to employ these results to estimate gravity wave characteristics at the bottomside F layer, and to assess their possible contributions to optimal seeding conditions for ESF and plasma instability growth rates. We also assess expected tidal influences on the environment in which plasma bubble seeding occurs, given their apparent large wind and temperature amplitudes at these altitudes. We conclude 1) that gravity waves can achieve large amplitudes at the bottomside F layer, 2) that tidal winds likely control the orientations of the gravity waves that attain the highest altitudes and have the greatest effects, 3) that the favored gravity wave orientations enhance most or all of the parameters influencing plasma instability growth rates, and 4) that gravity wave and tidal structures acting together have an even greater potential impact on plasma instability growth rates and plasma bubble seeding.

show abstract

Section: Implications Of Plasma Measurements For Gw Parametersmentioning

confidence: 99%

Gravity wave and tidal influences on equatorial spread F based on observations during the Spread F Experiment (SpreadFEx)

et al. 2008

View full text Add to dashboard Cite

show abstract

“…They can explicitly handle any observing geometry and can account for instrument sensitivity variations, hot spots, etc. They can also produce an estimate of the probable error at all points in the resulting image and can adjust the image resolution to give the best results for a given data set S/N (Kamalabadi et al 1999). Unfortunately, they scale quite badly with image size.…”

Section: Singular Value Decompositionmentioning

confidence: 99%

SPINR—A Wide‐Field Ultraviolet Spectral Imaging System

Cook¹,

Gsell²,

Golub³

et al. 2003

ApJ

View full text Add to dashboard Cite

We present the design, data analysis strategy, and flight results of a system for recording spectral images of astrophysical sources at ultraviolet wavelengths. The system, called the Spectrograph for Photometric Imaging with Numeric Reconstruction (SPINR), is a combination of a new optical design with novel observing and data processing strategies to record a full three-dimensional (two spatial and one spectral dimension) data cube. The SPINR technique allows the use of higher throughput spectrographs than conventional push-broom techniques and as a result delivers higher sensitivity.

show abstract

“…Dymond and Thomas [1999, 2001] and Kamalabadi et al [1999] recently demonstrated tomographic inversion algorithms for determining the two‐dimensional, altitude versus latitude, distribution of the F region electron density. These algorithms simultaneously invert a set of limb observations of the recombination radiation to produce the electron density.…”

Section: Introductionmentioning

confidence: 99%

Ionospheric response to the solar flare of 14 July 2000

et al. 2004

View full text Add to dashboard Cite

[1] We present our observations of the global ionospheric response to the X-class solar flare that started the Bastille Day storm on 14 June 2000. The observations were made using the Low-Resolution Airglow and Aurora Spectrograph (LORAAS) instrument on the Advanced Research and Global Observation Satellite (ARGOS). The ARGOS is in a Sun-synchronous orbit at 0230/1430 LT at approximately 840 km altitude. During the daytime the LORAAS observes the 911-Å emission; this emission is produced by radiative recombination of F region O + and electrons. We simultaneously invert approximately one-half of an orbit of 911-Å limb scans (approximately 30-45 min of observing) using a tomographic inversion technique to produce dayside electron density maps in the orbit plane. We compare our observations of orbits immediately before and after the flare to the orbit in which the flare occurred. We observed a 41% increase in the average 911-Å brightness during the flare orbit compared to the orbits before and after the flare. This corresponds to an overall increase of electron density by $20%. This density enhancement has largely decayed by the next orbit. At altitudes near the F region peak, 250-450 km, the density enhancement has decayed to the preflare value. An enhancement of the electron densities at approximately À50°geomagnetic latitude has moved northward in the flare orbit, which may be indicative of enhanced meridional transport postflare. We compared our results to output from the SAMI-2 model, which was run for the flare study presents in the work of Meier et al. [2002].

show abstract

A statistical framework for space‐based EUV ionospheric tomography

Cited by 41 publications

References 18 publications

Gravity wave and tidal influences on equatorial spread F based on observations during the Spread F Experiment (SpreadFEx)

Gravity wave and tidal influences on equatorial spread F based on observations during the Spread F Experiment (SpreadFEx)

SPINR—A Wide‐Field Ultraviolet Spectral Imaging System

Ionospheric response to the solar flare of 14 July 2000

Contact Info

Product

Resources

About