Analysis of Balmer α intensity measurements near solar minimum

Bishop, James; Harlander, John M.; Nossal, S. M.; Roesler, F. L.

doi:10.1016/s1364-6826(00)00212-1

Cited by 28 publications

(79 citation statements)

References 38 publications

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“…The Balmer a column emission rate (also referred to as intensities in the following) is dependent upon the hydrogen density profile, the solar Lyman b line center excitation flux, and the observational viewing geometry. A portion of the signal is also due to multiple scattering of Lyman b into the Earth's shadow (see e.g., Anderson et al, 1987;Bishop et al, 2001) and from cascade contributions from hydrogen excitation by higher order solar Lyman series lines (Meier, 1995;Nossal et al, 1998). Typical zenith Balmer a intensities are in the range of 2-15 Rayleighs.…”

Section: Introductionmentioning

confidence: 99%

“…Although ground-based Fabry-Perot observations of geocoronal hydrogen have been made over the last several decades with increasing instrumental capabilities (Reynolds et al, 1973;Atreya et al, 1975;Meriwether et al, 1980;Yelle and Roesler, 1985;Shih et al, 1985, Kerr et al, 1986, 2001aKerr and Tepley, 1988;He et al, 1993; , 1997Bishop et al, 2001Bishop et al, , 2004Mierkiewicz, 2002; and references therein), recent advances in detector technology, such as the charged-coupled-device (CCD), and its application to Fabry-Perot spectroscopy (e.g., CCD annular summing spectroscopy), have greatly improved the quality and quantity of geocoronal Balmer a emissions data. Scientific areas of focus include:…”

Section: Introductionmentioning

confidence: 99%

“…This paper will discuss the technique of FabryPerot spectroscopy as applied to ground-based geocoronal hydrogen Balmer a observations, including strategies for obtaining data of sufficient precision and scope to address the scientific areas of focus outlined above. Observations by the Wisconsin group and collaborators (Reynolds et al, 1973;Yelle and Roesler, 1985;Shih et al, 1985;Harlander and Roesler, 1989;Nossal et al, 1993Nossal et al, , 1997Nossal et al, , 1998Nossal et al, , 2001Nossal et al, , 2004Coakley et al, 1996;Bishop et al, 2001Bishop et al, , 2004Mierkiewicz, 2002) will be used to illustrate capabilities and challenges associated with using Fabry-Perot spectroscopy as a means to explore the hydrogen geocorona.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Geocoronal hydrogen studies using Fabry–Perot interferometers, part 1: Instrumentation, observations, and analysis

Mierkiewicz

Roesler

Nossal

et al. 2006

Journal of Atmospheric and Solar-Terrestrial Physics

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geocoronal hydrogen studies using Fabry–Perot interferometers, part 1: Instrumentation, observations, and analysis

Mierkiewicz

Roesler

Nossal

et al. 2006

Journal of Atmospheric and Solar-Terrestrial Physics

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“…They noted a discrepancy of the order of a factor two between observed intensities and model results. This problem has been recently analyzed and solved by Bishop et al (2001), using a nonisothermal Lyman-β radiative transport code with updated Lyman-β fluxes and corrected atomic hydrogen profiles in the thermosphere.…”

Section: What Is the Lyman Series?mentioning

confidence: 99%

“…So there must be a branching ratio between process (2) and process (3). Bishop et al (2001) used 0.12 for process (3) in their detailed analysis of the H-α line.…”

Section: What Is the Lyman Series?mentioning

confidence: 99%

Aeronomy, a 20th Century emergent science: the role of solar Lyman series

Kockarts

2002

Ann. Geophys.

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Abstract.Aeronomy is, by definition, a multidisciplinary science which can be used to study the terrestrial atmosphere, as well as any planetary atmosphere and even the interplanetary space. It was officially recognized in 1954 by the International Union of Geodesy and Geophysics. The major objective of the present paper is to show how aeronomy developed since its infancy. The subject is so large that a guideline has been chosen to see how aeronomy affects our atmospheric knowledge. This guideline is the solar Lyman alpha radiation which has different effects in the solar system. After a short description of the origins of aeronomy the first observations of this line are summarized since the beginning of the space age. Then the consequences of these observations are analyzed for the physics and chemistry of the neutral terrestrial atmosphere. New chemical processes had to be introduced, as well as new transport phenomena. Solar Lyman alpha also influences the structure of the Earth's ionosphere, particularly the D-region. In the terrestrial exosphere, solar Lyman alpha scattered resonantly by atomic hydrogen is at present the only way to estimate this constituent in an almost collisionless medium. Since planetary atmospheres also contain atomic hydrogen, the Lyman alpha line has been used to deduce the abundance of this constituent. The same is true for the interplanetary space where Lyman alpha observations can be a good tool to determine the concentration. The last section of the paper presents a question which is intended to stimulate further research in aeronomy.

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The geocoronal H α cascade component determined from geocoronal H β intensity measurements

2014

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Geocoronal H α and H β intensity measurements using the Wisconsin H α Mapper Fabry-Perot are used to determine the intensity of the H α cascade component. From basic atomic physics and the work of Meier (1995), we show that the total cascade in geocoronal H α emission is 0.52 ± 0.03 times the geocoronal H β intensity, I(H β), for solar Lyman series excitation of geocoronal hydrogen. The results are consistent with the H α cascade measurements of Mierkiewicz et al. (2012), which were determined directly from the analysis of H α line profile measurements, and significantly narrow the range of uncertainty in the cascade measurement. Accounting for cascade is essential in determining exospheric effective temperatures and dynamics from the shape of the geocoronal H α line.

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Analysis of Balmer α intensity measurements near solar minimum

Cited by 28 publications

References 38 publications

Geocoronal hydrogen studies using Fabry–Perot interferometers, part 1: Instrumentation, observations, and analysis

Geocoronal hydrogen studies using Fabry–Perot interferometers, part 1: Instrumentation, observations, and analysis

Aeronomy, a 20th Century emergent science: the role of solar Lyman series

The geocoronal H α cascade component determined from geocoronal H β intensity measurements

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