Bibliography



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Found 4 entries in the Bibliography.


Showing entries from 1 through 4


2019

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

2017

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

2016

Thermospheric hydrogen response to increases in greenhouse gases

We investigated thermospheric hydrogen response to increase in greenhouse gases and the dependence of this response to solar activity, using a global mean version of the National Center for Atmospheric Research Thermosphere-Ionosphere-Mesosphere-Electrodynamics General Circulation Model. We separately doubled carbon dioxide (CO2) and methane (CH4) to study the influence of temperature and changes to source species for hydrogen. Our results indicate that both CO2 cooling and CH4 changes to the source species for hydrogen lead to predicted increases in the upper thermospheric hydrogen density. At 400 km, hydrogen increases ~30\% under solar maximum and ~25\% under solar minimum responding to doubling of CH4, indicating that hydrogen response to the source variation due to CH4 increase is relatively independent of solar activity. On the other hand, hydrogen response to doubling of CO2 highly depends on solar activity. At 400 km, doubling of CO2 results in an ~7\% hydrogen increase at solar maximum, whereas it is ~25\% at solar minimum. Consequently, at solar maximum, the predicted ~40\% increase in atomic hydrogen in the upper thermosphere is primarily due to the source variation as a result of doubling of CH4, whereas at solar minimum, both cooling due to doubling of CO2 and the source variation due to doubling of CH4 have commensurate effects, resulting in an approximate 50\% increase in the modeled upper thermospheric hydrogen.

Nossal, S.; Qian, L.; Solomon, S.; Burns, A.; Wang, W.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 03/2016

YEAR: 2016     DOI: 10.1002/2015JA022008

2008

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:



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