Bibliography

Neutral Hydrogen in the Terrestrial Thermosphere and Exosphere

The exosphere is the interface between the Earth s neutral atmosphere and interplanetary space. Our understanding of this important interface, through observations of its mean state and its response to external forcing, will provide important constraints as we seek to develop a complete picture of our complicated space-atmosphere system. This chapter will highlight the contributions of ground-based geocoronal hydrogen observations to our understanding of this system. Observations are made throughout the night; the base of the Earth s shadow is used as a first-order probe of the exosphere s altitude structure. Major areas of scientific focus include (1) high resolution observations of the geocoronal hydrogen Balmer α line profile and its relation to excitation mechanisms, effective temperature, and exospheric physics; (2) retrieval of geocoronal hydrogen parameters such as the hydrogen column abundance [H], the hydrogen density profile [H]( z ), and the photochemically initiated hydrogen flux ϕ (H); and (3) long-term observations of the geocoronal hydrogen column emission intensity for the investigation of natural variability, such as solar cycle trends, and of potential anthropogenic change due to increases in atmospheric concentrations of greenhouse gases.

Mierkiewicz, Edwin;

Published by:       Published on:

YEAR: 2021     DOI: 10.1002/9781119815631.ch8

Fabry-Perot spectrometer; geocoronal Balmer; ground-based geocoronal hydrogen observations; hydrogen density profile; hydrostatic equilibrium; neutral hydrogen; terrestrial exosphere; terrestrial thermosphere

SIHLA, a mission of opportunity to L1 to map H Lyman alpha emissions from the heliopause, the interplanetary medium, the Earth's geocorona and comets

Paxton, Larry; Provornikova, Elena; Roelof, Edmond; emerais, Eric; Izmodenov, Vladislav; Katushkina, Olga; Mierkiewicz, Edwin; Baliukin, Igor; Gruntman, Mike; Taguchi, Makoto; , others;

Published by:       Published on:

YEAR: 2020     DOI:

Geocoronal hydrogen emission variation over two solar cycles

Ground-based hydrogen Balmer-α observations from Northern midlatitudes span multiple solar cycles, facilitating investigation of decadal scale variations, including natural variability in the hydrogen response to solar geophysical changes. Here we present a reanalysis of ground-based hydrogen emission observations from the early 1990s and their comparison with observations obtained in 2000–2001 in the context of the extended Northern Hemisphere midlatitude geocoronal hydrogen emission data set.

Nossal, SM; Mierkiewicz, EJ; Roesler, FL; Woodward, RC; Gardner, DD; Haffner, LM;

Published by: Journal of Geophysical Research: Space Physics      Published on:

YEAR: 2019     DOI: 10.1029/2019JA026903

Constraining Balmer alpha fine structure excitation measured in geocoronal hydrogen observations

Further, in the case of the GUVI Lyman α data, even independent satellite parameter specifications were deemed insufficient to adequately forward model the limb scan observations

Gardner, DD; Mierkiewicz, EJ; Roesler, FL; Nossal, SM; Haffner, LM;

Published by: Journal of Geophysical Research: Space Physics      Published on:

YEAR: 2017     DOI: 10.1002/2017JA024055

Hydrogen in the Upper Atmosphere II Posters

Paxton, Larry; Waldrop, Lara; Mierkiewicz, Edwin; Mlynczak, Martin;

Published by:       Published on:

YEAR: 2015     DOI:

A coordinated multi-line investigation aimed at deriving hydrogen densities in the upper atmosphere

Mierkiewicz, Edwin; Roesler, Frederick; Stephan, Andrew; Nossal, Susan;

Published by: 37th COSPAR Scientific Assembly      Published on:

YEAR: 2008     DOI: