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Found 18 entries in the Bibliography.
Showing entries from 1 through 18
2015 |
Auroral precipitation models and space weather
Newell, Patrick; Liou, Kan; Zhang, Yongliang; Sotirelis, Thomas; Mitchell, EJ; Mitchell, Elizabeth; Published by: Auroral dynamics and space weather Published on: |
2014 |
Local Geomagnetic Indices and the Prediction of Auroral Power The aurora has been related to magnetometer observations for centuries, and to geomagnetic indices for decades. As the number of stations and data processing power increases, just how auroral power (AP) relates to geomagnetic observations becomes a more tractable question. This paper compares Polar UVI AP observations during 1997 with a variety of indices. Local time (LT) versions of the SuperMAG auroral electrojet (SME) are introduced and examined, along with the corresponding upper and lower envelopes (SMU< ... Published by: Journal of Geophysical Research: Space Physics Published on: 12/2014 YEAR: 2014   DOI: 10.1002/2014JA020524 AURORA; auroral electrojet; indices; Pedersen current; Prediction |
OVATION Prime-2013: Extension of auroral precipitation model to higher disturbance levels OVATION Prime (OP) is an auroral precipitation model parameterized by solar wind driving. Distinguishing features of the model include an optimized solar wind-magnetosphere coupling function (dΦMP/dt) which predicts auroral power significantly better than\ Kp\ or other traditional parameters, the separation of aurora into categories (diffuse aurora, monoenergetic, broadband, and ion), the inclusion of seasonal variations, and separate parameter fits for each magnetic latitu ... Newell, P.; Liou, K.; Zhang, Y.; Sotirelis, T.; Paxton, L.; Mitchell, E.; Published by: Space Weather Published on: 06/2014 YEAR: 2014   DOI: 10.1002/swe.v12.610.1002/2014SW001056 |
Developing a Multi-Element Geospace Investigation to Understand the Impact of Hemispheric Assymetry
Paxton, Larry; Newell, Patrick; Stromme, Anja; Ridley, Aaron; Kozyra, Janet; Mitchell, Elizabeth; Published by: Published on: |
Understanding Hemispheric Asymmetry and Space Weather I Posters
Paxton, Larry; Newell, Patrick; Stromme, Anja; Ridley, Aaron; Published by: Published on: |
Newell, Patrick; Liou, Kan; Zhang, Yongliang; Sotirelis, Thomas; Paxton, Larry; Mitchell, Elizabeth; Published by: Published on: |
2013 |
Statistical comparison of isolated and non-isolated auroral substorms The present study compares isolated and non-isolated substorms in terms of their global morphology and energy deposition. The analysis is based on a list of geomagnetic substorm onsets identified with magnetometer data from SuperMAG and published previously by Newell and Gjerlove (2011a). Isolated substorms are defined as those with separation of two consecutive onsets no less than 3 h. The auroral data are obtained from the global ultraviolet imager (GUVI) on board the TIMED satellite and are rebinned into typical magnet ... Liou, Kan; Newell, Patrick; Zhang, Yong-Liang; Paxton, Larry; Published by: Journal of Geophysical Research: Space Physics Published on: 05/2013 YEAR: 2013   DOI: 10.1002/jgra.50218 |
2012 |
Evaluation of OVATION Prime as a forecast model for visible aurorae This study evaluates the ability of the OVATION Prime auroral precipitation model to provide operational forecasts of the visible aurora. An operational implementation would primarily provide the general public with some guidance for viewing the aurora. We evaluate the likelihood that if aurorae are predicted to be visible at a location, they will be seen there within the hour. Nighttime model forecasts were validated with Polar Ultraviolet Imager data for Kp >= 3 and for the years 1997 and 1998. The overall fore ... Machol, Janet; Green, Janet; Redmon, Robert; Viereck, Rodney; Newell, Patrick; Published by: Space Weather: The International Journal of Research and Applications Published on: 09/2012 YEAR: 2012   DOI: 10.1029/2011SW000746 |
2011 |
Lu, G.; Li, W.; Raeder, J.; Deng, Y.; Rich, F.; Ober, D.; Zhang, Y.; Paxton, L.; Ruohoniemi, J.; Hairston, M.; Newell, P.; Published by: Journal of Geophysical Research Published on: Jan-01-2011 YEAR: 2011   DOI: 10.1029/2011JA017043 |
TIMED/GUVI observation of solar illumination effect on auroral energy deposition
Liou, K.; Zhang, Y.-L.; Newell, P.; Paxton, L.; Carbary, J.; Published by: Journal of Geophysical Research Published on: Jan-01-2011 YEAR: 2011   DOI: 10.1029/2010JA016402 |
2010 |
Predictive ability of four auroral precipitation models as evaluated using Polar UVI global images
Newell, P.; Sotirelis, T.; Liou, K.; Lee, A.; Wing, S.; Green, J.; Redmon, R.; Published by: Space Weather Published on: Jan-01-2010 YEAR: 2010   DOI: 10.1029/2010SW000604 |
2009 |
Ionospheric control of auroral occurrence
Liou, Kan; Zhang, Yongliang; Newell, Patrick; Paxton, Larry; Published by: Published on: |
Does the polar cap disappear under an extended strong northward IMF?
Zhang, Yongliang; Paxton, Larry; Newell, Patrick; Meng, Ching-I; Published by: Journal of atmospheric and solar-terrestrial physics Published on: |
2005 |
The coincident TIMED/Global Ultraviolet Imager (TIMED/GUVI) optical and DMSP particle observations have revealed new features of the optical signature of the polar cusp under a southward interplanetary magnetic field (IMF). We have found that cusp auroras usually take the shape of a thin arc with a width around 100\textendash200 km. This provides the first far-ultraviolet evidence of the narrow cusp under a southward IMF [
Zhang, Y; Meng, C-I; Paxton, LJ; Morrison, D; Wolven, B; Kil, H; Newell, P; Wing, S; Christensen, AB; Published by: Journal of Geophysical Research: Space Physics (1978\textendash2012) Published on: YEAR: 2005   DOI: 10.1029/2004JA010707 |
2003 |
Optical Signature of Polar Cusp During Southward IMF Bz Observed by TIMED/GUVI and DMSP The GUVI instrument on board the TIMED satellite provides unique multi-wavelength observations of polar region emissions. In this study we focus on the identification of the polar cusp region during southward IMF conditions. Using simultaneous DMSP particle observations, the optical signatures and dynamics of the polar cusp region are investigated. We will address which of the five GUVI wavelengths can best be used for optical identification of the cusp precipitation by comparing images of various wavelengths. These new G ... Zhang, Y.; Meng, C.~I.; Paxton, L.~J.; Morrison, D.; Wolven, B.; Kil, H.; Newell, P.; Wing, S.; Christensen, A.~B.; Published by: AGU Fall Meeting Abstracts Published on: 2455 Particle precipitation; 2704 Auroral phenomena (2407); 2724 Magnetopause; and boundary layers; cusp |
2002 |
Meng, CI; Zhang, Y; Paxton, LJ; Newell, PT; Sotirelis, TS; Christensen, AB; Published by: Published on: |
2000 |
Lui, ATY; Chapman, SC; Liou, K; Newell, PT; Meng, CI; Brittnacher, M; Parks, GK; Williams, DJ; McEntire, RW; Christon, SP; , others; Published by: JOHNS HOPKINS APL TECHNICAL DIGEST Published on: |
1999 |
Advancing our understanding of the atmosphere and ionosphere using remote sensing techniques
Greenwald, Raymond; Lloyd, Steven; Newell, Patrick; Paxton, Larry; Yee, Jeng-Hwa; Published by: Johns Hopkins APL technical digest Published on: |
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