Airborne ionospheric and optical measurements of noontime aurora

Whalen, J. A.; Büchau, J.; Wagner, R. A.

doi:10.1016/0021-9169(71)90066-3

Cited by 51 publications

(23 citation statements)

References 15 publications

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“…This is in very good agreement with previous work (Omholt, 1955;Whalen et al, 1971). As a rough measure of the accuracy of this procedure, the average deviation of the (foE )4 points from the lines connecting the ISIS-2 data points is 26 %.…”

Section: Critical Frequencysupporting

confidence: 92%

“…This ion production rate is proportional to the total energy flux deposited by the precipitating particles. This explanation, originally put forth by Omholt (1955) and further supported by Whalen et al (1971) and Jones (1974), provides the basis for the present comparison between the ISIS-2 measurement of incoming particle energy and…”

Section: Critical Frequencysupporting

confidence: 57%

“…Associated with this diffuse, often subvisual aurora is a relatively thick band of E-region ionization known as auroral-E, apparently caused by the same particles which produce the diffuse aurora (Whalen et al, 1971;Whalen et al, 1977;and Weber et al, 1977). In spite of the fact that a clear association between the diffuse aurora and auroral-E ionization has been made, a detailed investigation of the properties of the incident particle spectrum, and its relation to the properties of aurora.l-E as measured by an ionosphere sounder, has not been previously undertaken.…”

Section: Introductionmentioning

confidence: 99%

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Satellite Particle Observations and Coincident Auroral-E Ionization.

Sharber¹

1979

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Section: Critical Frequencysupporting

confidence: 92%

Section: Critical Frequencysupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Satellite Particle Observations and Coincident Auroral-E Ionization.

Sharber¹

1979

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“…Red line aurora are often observed poleward of the dayside auroral oval (Whalen et al, 1971;Murphree et al, 1980;Elphinstone et al, 1992), such emissions being excited by low energy (of order 100 eV) electrons ± consistent with the energy characteristics of unaccelerated magnetosheath plasma of cusp/cleft origin ± on newly-opened ®eld lines (Lockwood et al, 1993a;Sandholt et al, 1996). Hence, the equatorwards boundary of the red line aurora could be related to the Fig.…”

Section: General Morphology and Imf Dependence Of The Dayside Auroramentioning

confidence: 95%

Meridian-scanning photometer, coherent HF radar, and magnetometer observations of the cusp: a case study

et al. 1999

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Abstract. The dynamics of the cusp region and postnoon sector for an interval of predominantly IMF B y , B z < 0 nT are studied with the CUTLASS Finland coherent HF radar, a meridian-scanning photometer located at Ny A Ê lesund, Svalbard, and a meridional network of magnetometers. The scanning mode of the radar is such that one beam is sampled every 14 s, and a 30°azimuthal sweep is completed every 2 minutes, all at 15 km range resolution. Both the radar backscatter and red line (630 nm) optical observations are closely colocated, especially at their equatorward boundary. The optical and radar aurora reveal three dierent behaviours which can interchange on the scale of minutes, and which are believed to be related to the dynamic nature of energy and momentum transfer from the solar wind to the magnetosphere through transient dayside reconnection. Two interpretations of the observations are presented, based upon the assumed location of the open/closed ®eld line boundary (OCFLB). In the ®rst, the OCFLB is co-located with equatorward boundary of the optical and radar aurora, placing most of the observations on open ®eld lines. In the second, the observed aurora are interpreted as the ionospheric footprint of the region 1 current system, and the OCFLB is placed near the poleward edge of the radar backscatter and visible aurora; in this interpretation, most of the observations are placed on closed ®eld lines, though transient brightenings of the optical aurora occur on open ®eld lines. The observations reveal several transient features, including poleward and equatorward steps in the observed boundaries,``braiding'' of the backscatter power, and 2 minute quasi-periodic enhancements of the plasma drift and optical intensity, predominantly on closed ®eld lines.

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“…The diffuse glow seen in the DMSP images may contain contributions not only from the diffuse aurora [Lui and Anger , 1973;Whalen et al, 1971;Snyder et al , l974J but from D-region auroral absorption , unresolved discrete auroras , Flayer auroras and ground albedo [Whalen et al , 1977] . It is not possible at this stage to establish detailed physical correspon--dences between the auroral displays on the DMSP images and particle precipitations and hence between the optical images and the particle-generated electron density gradients.…”

Section: Discussionmentioning

confidence: 99%

High Latitude Ionospheric Gradients and Their Relationships to Auroral and Magnetospheric Boundaries.

Chacko¹,

Mendillo²

1977

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Airborne ionospheric and optical measurements of noontime aurora

Cited by 51 publications

References 15 publications

Satellite Particle Observations and Coincident Auroral-E Ionization.

Satellite Particle Observations and Coincident Auroral-E Ionization.

Meridian-scanning photometer, coherent HF radar, and magnetometer observations of the cusp: a case study

High Latitude Ionospheric Gradients and Their Relationships to Auroral and Magnetospheric Boundaries.

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