GUVI Biblio

The Role of High Energy Photoelectrons on the Dissociation of Molecular Nitrogen in Earth's Ionosphere

Soft x-ray radiation from the sun is responsible for the production of high energy photoelectrons in the D and E regions of the ionosphere, where they deposit most of their ionization

Samaddar, Srimoyee; Venkataramani, Karthik; Yonker, Justin; Bailey, Scott; , others;

Published by: arXiv preprint arXiv:2209.11185      Published on:

YEAR: 2022     DOI: 10.48550/arXiv.2209.11185

Sounding Rocket Observation of Nitric Oxide in the Polar Night

An altitude profile of Nitric Oxide (NO) in the 80–110 km altitude range was measured in the polar night from a sounding rocket on 27 January 2020. The observations were made using the technique of stellar occultation with a UV spectrograph observing the γ (1,0) band of NO near 215 nm. The tangent point for the altitude profile was at 74° latitude, a location that had been in darkness for 80 days. The retrieved slant column density profile is interpreted using an assumed four-parameter analytic profile shape. Retrievals ...

Bailey, Scott; McClintock, William; Carstens, Justin; Thurairajah, Brentha; Das, Saswati; Randall, Cora; Harvey, Lynn; Siskind, David; Stevens, Michael; Venkataramani, Karthik;

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

YEAR: 2022     DOI: 10.1029/2021JA030257

Lower thermosphere; mesosphere; nitric oxide; polar night; sounding rocket; stellar occultation

The Role of Solar Soft X-rays Irradiance in Thermospheric Structure

We use a new Atmospheric Chemistry and Energetics one-dimensional (ACE1D) thermospheric model to show that the energies deposited by the solar soft x-rays in the lower

Samaddar, Srimoyee; Venkataramani, Karthik; Bailey, Scott; , others;

Published by: arXiv preprint arXiv:2209.10543      Published on:

YEAR: 2022     DOI: 10.48550/arXiv.2209.10543

A Model of the Globally-averaged Thermospheric Energy Balance

Similar to the MSIS data, we bin the GUVI temperatures by latitude It should be noted that GUVI observations at high values of While the GUVI observations cannot be compared directly

Venkataramani, Karthik; Bailey, Scott; Samaddar, Srimoyee; Yonker, Justin;

Published by: arXiv preprint arXiv:2211.05301      Published on:

YEAR: 2022     DOI: 10.48550/arXiv.2211.05301

Comparison of the Thermospheric Nitric Oxide Emission Observations and the GITM Simulations: Sensitivity to Solar and Geomagnetic Activities

An accurate estimate of the energy budget (heating and cooling) of the ionosphere and thermosphere, especially during space weather events, has been a challenge. The abundance of Nitric Oxide (NO), a minor species in the thermosphere, is an important component of energy balance here because its production comes from energy sources able to break the strong bond of molecular nitrogen, and infrared emissions from NO play an important role in thermospheric cooling. Recent studies have significantly improved our understanding ...

Lin, Cissi; Deng, Yue; Venkataramani, Karthik; Yonker, Justin; Bailey, Scott;

Published by: Journal of Geophysical Research: Space Physics      Published on: 10/2018

YEAR: 2018     DOI: 10.1029/2018JA025310

Comparison of the Thermospheric Nitric Oxide Emission Observations and the Global Ionosphere-Thermosphere Model (GITM) Simulations: Sensitivity to Solar and Geomagnetic Activities

The magnitude of enhancement observed in column density agrees well with the cases observed by TIMED/GUVI −8 W/m3) agree well with TIMED/SABER and GUVI measurements.

Lin, Cissi; Deng, Yue; Venkataramani, Karthik; Yonker, Justin; Bailey, Scott;

Published by: arXiv preprint arXiv:1807.01380      Published on:

YEAR: 2018     DOI: https://doi.org/10.48550/arXiv.1807.01380

Parameterization of Nitric Oxide Emissions in the Thermosphere

Lin, CYT; Deng, Yue; Venkataramani, Karthik; Yonker, Justin; Bailey, Scott;

Published by:       Published on:

YEAR: 2016     DOI:

Equatorial ionization anomaly development as studied by GPS TEC and foF2 over Brazil: A comparison of observations with model results from SUPIM and IRI-2012

The equatorial ionization anomaly (EIA) development is studied using the total electron content (TEC) observed by the Global Positioning System (GPS) satellites, the F2-layer critical frequency (foF2) as measured by digisondes operated in the Brazilian sector, and by model simulation using the SUPIM (Sheffield University Plasmasphere Ionosphere Model). We have used two indices based on foF2 and TEC to represent the strength of the EIA Southern Anomaly Crest (SAC), which are denoted, respectively, by SAC( ...

Nogueira, P.A.B.; Abdu, M.A.; Souza, J.R.; Batista, I.S.; Bailey, G.J.; Santos, A.M.; Takahashi, H.;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics      Published on: 11/2013

YEAR: 2013     DOI: 10.1016/j.jastp.2013.08.013

Equatorial anomaly; foF2; Ionospheric modeling; TEC

Physical mechanisms of the ionospheric storms at equatorial and higher latitudes during the recovery phase of geomagnetic storms

The paper studies the physical mechanisms of the ionospheric storms at equatorial and higher latitudes, which are generally opposite both during the main phase (MP) and recovery phase (RP) of geomagnetic storms. The mechanisms are based on the natural tendency of physical systems to occupy minimum energy state which is most stable. The paper first illustrates the recent developments in the understanding of the mechanisms during daytime MPs when generally negative ionospheric storms (in Nmax and TEC) develop at equatorial ...

Balan, N.; Otsuka, Y.; Nishioka, M.; Liu, J; Bailey, G.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 05/2013

YEAR: 2013     DOI: 10.1002/jgra.50275

Geomagnetic storms; Ionospheric storms; physical mechanisms

Operational specification and forecasting advances for Dst, LEO thermospheric densities, and aviation radiation dose and dose rate

Tobiska, W; Knipp, DJ; Burke, WJ; Bouwer, D; Bailey, JJ; Hagan, MP; Didkovsky, LV; Garrett, HB; Bowman, BR; Gannon, JL; , others;

Published by:       Published on:

YEAR: 2013     DOI:

Bright polar mesospheric clouds formed by main engine exhaust from the space shuttle's final launch

Stevens, Michael; Lossow, Stefan; Fiedler, Jens; Baumgarten, Gerd; übken, Franz-Josef; Hallgren, Kristofer; Hartogh, Paul; Randall, Cora; Lumpe, Jerry; Bailey, Scott; Niciejewski, R.; Meier, R.; Plane, John; Kochenash, Andrew; Murtagh, Donal; Englert, Christoph;

Published by: Journal of Geophysical Research: Atmospheres      Published on: Apr-10-2013

YEAR: 2012     DOI: 10.1029/2012JD017638

Extreme Ultraviolet Variability Experiment (EVE) on~the~Solar Dynamics Observatory (SDO): Overview~of~Science Objectives, Instrument Design, Data~Products, and Model Developments

The highly variable solar extreme ultraviolet (EUV) radiation is the major energy input to the Earth\textquoterights upper atmosphere, strongly impacting the geospace environment, affecting satellite operations, communications, and navigation. The Extreme ultraviolet Variability Experiment (EVE) onboard the NASA Solar Dynamics Observatory (S ...

Woods, T.; Eparvier, F.; Hock, R.; Jones, A.; Woodraska, D.; Judge, D.; Didkovsky, L.; Lean, J.; Mariska, J.; Warren, H.; McMullin, D.; Chamberlin, P.; Berthiaume, G.; Bailey, S.; Fuller-Rowell, T.; Sojka, J.; Tobiska, W.; Viereck, R.;

Published by: Solar Physics      Published on: 01/2012

YEAR: 2012     DOI: 10.1007/s11207-009-9487-6

EVE; SDO; Solar EUV irradiance; Space weather research

Ultraviolet Remote Sensing of Nitric Oxide in the Thermosphere Using the TIMED/GUVI Instrument

DeMajistre, R; Wolven, BC; Paxton, LJ; Zhang, Y; Schaefer, RK; Bailey, SM; Yonker, JD; Thurairajah, B;

Published by:       Published on:

YEAR: 2012     DOI:

Response of the ionosphere to super geomagnetic storms: Observations and modeling

Lekshmi, Vijaya; Balan, N; Vaidyan, VK; Alleyne, H; Bailey, GJ;

Published by: Advances in Space Research      Published on:

YEAR: 2008     DOI:

Photolysis and Fluorescence in the/delta and/epsilon Bands of Thermospheric NO

Yonker, JD; Bailey, SM; Paxton, LJ;

Published by:       Published on:

YEAR: 2008     DOI:

Comparing the Measured N2 Lyman-Birge-Hopfield (LBH) Band Brightness in the Dayglow With Model Calculations: Investigating the Importance of Cascading as a Source of Excitation.

Aksnes, A; Eastes, R; Budzien, S; Dymond, K; Bailey, S; Jones, A;

Published by:       Published on:

YEAR: 2005     DOI:

Solar EUV Experiment (SEE): Mission overview and first results

[1]\ The Solar EUV Experiment (SEE) is one of four scientific instruments on the NASA Thermosphere Ionosphere Mesosphere Energetics Dynamics (TIMED) spacecraft, which has been simultaneously observing the Sun and Earth\textquoterights upper atmosphere since January 2002. The SEE instrument measures the irradiance of the highly variable, solar extreme ultraviolet (EUV) radiation, one of the major energy sources for the upper atmosphere. The primary SEE data product is the solar spectral irradiances from 0.1 to 194 nm ...

Woods, Thomas; Eparvier, Francis; Bailey, Scott; Chamberlin, Phillip; Lean, Judith; Rottman, Gary; Solomon, Stanley; Tobiska, Kent; Woodraska, Donald;

Published by: Journal of Geophysical Research: Space Physics (1978\textendash2012)      Published on:

YEAR: 2005     DOI: 10.1029/2004JA010765

thermosphere; solar activity cycle; solar irradiance; ultraviolet emissions; solar effects

Thermospheric Response to Solar EUV during Quiet and Flare Conditions

Solomon, SC; Qian, L; Gladstone, GR; Bailey, SM; Rodgers, EM;

Published by:       Published on:

YEAR: 2005     DOI:

New measurements by the TIMED solar extreme-ultraviolet experiment: Implications for thermospheric modeling

Solomon, SC; Bailey, SM; Eparvier, FG; Gladstone, GR; Paxton, LJ; Woods, TN;

Published by:       Published on:

YEAR: 2003     DOI:

The Response of Thermospheric Nitric Oxide to the Geomagnetic Storm of April 2002

Bailey, SM; Crowley, G; Solomon, SC; Baker, DN;

Published by:       Published on:

YEAR: 2002     DOI:

New Solar Extreme-Ultraviolet and Soft X-ray Measurements: Model Comparisons with Thermosphere and Ionosphere Observations

Solomon, SC; Bailey, SM; Christensen, AB; Eparvier, FG; Gladstone, GR; Paxton, LJ; Wolven, BC; Woods, TN;

Published by:       Published on:

YEAR: 2002     DOI: