Search Results - "Sotirelis, Thomas"

Seasonal variations in diffuse, monoenergetic, and broadband aurora by Newell, Patrick T., Sotirelis, Thomas, Wing, Simon

“…The only previously established seasonal auroral variation is that of intense monoenergetic aurora, corresponding to quasi‐static acceleration by…”
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Statistical relationship between large-scale upward field-aligned currents and electron precipitation by Korth, Haje, Zhang, Yongliang, Anderson, Brian J., Sotirelis, Thomas, Waters, Colin L.

“…Simultaneous observations of Birkeland currents by the constellation of Iridium satellites and N2 Lyman‐Birge‐Hopfield (LBH) auroral emissions measured by the…”
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Empirical relationship between electron precipitation and far-ultraviolet auroral emissions from DMSP observations by Sotirelis, Thomas, Korth, Haje, Hsieh, Syau-Yun, Zhang, Yongliang, Morrison, Daniel, Paxton, Larry

“…Auroral emissions observed in the far‐ultraviolet wavelength range are compared with measurements of the coincident precipitating electrons and ions that…”
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Substorm cycle dependence of various types of aurora by Newell, Patrick T., Lee, Anna R., Liou, Kan, Ohtani, Shin-I., Sotirelis, Thomas, Wing, Simon

“…We combine 4861 identifications of substorm onsets from satellite global imagers (Polar UVI and IMAGE FUV) with DMSP particle data to investigate the substorm…”
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Survey of reconnection signatures in auroral oval ion precipitation by Sotirelis, Thomas S., Gjerloev, Jesper W., Hairston, Marc

“…The protons and electrons on newly reconnected field lines exhibit time-of-flight effects that have been observed and modelled on both the dayside and…”
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Response of northern winter polar cap to auroral substorms by Liou, Kan, Sotirelis, Thomas

“…The three‐phase substorm sequence has been generally accepted and is often tied to the Dungey cycle. Although previous studies have mostly agreed on the…”
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Ultraviolet insolation drives seasonal and diurnal space weather variations by Newell, Patrick T., Sotirelis, Thomas, Skura, Joseph P., Meng, Ching-I., Lyatsky, Wladislav

“…We present several findings that improve the understanding of the seasonal and diurnal variation in auroral and magnetospheric activity. The total ionospheric…”
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Substorm Occurrence and Intensity Associated With Three Types of Solar Wind Structure by Liou, Kan, Sotirelis, Thomas, Richardson, Ian

“…This paper presents the results of a study of the characteristics of substorms that occurred during three distinct types of solar wind: coronal mass ejection…”
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Statistical study of polar negative magnetic bays driven by interplanetary fast‐mode shocks by Liou, Kan, Sotirelis, Thomas, Gjerloev, Jesper

“…The question of whether an interplanetary (IP) fast‐mode shock can trigger the substorm expansion is still not resolved. Some scientists believe that the…”
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Polar Ultraviolet Imager observations of global auroral power as a function of polar cap size and magnetotail stretching by Newell, Patrick T., Liou, Kan, Sotirelis, Thomas, Meng, Ching‐I.

“…The Polar Ultraviolet Imager (UVI) instrument can quantitatively determine important magnetospheric descriptors, notably including substorm onset time and…”
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Control of the East‐West Component of the Interplanetary Magnetic Field on the Occurrence of Magnetic Substorms by Liou, Kan, Sotirelis, Thomas, Mitchell, Elizabeth

“…We study the effects of the east‐west (y) component of the interplanetary magnetic field (IMF) on the occurrence of substorms by analyzing 16,743 magnetic…”
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North-South Asymmetry in the Geographic Location of Auroral Substorms correlated with Ionospheric Effects by Liou, Kan, Sotirelis, Thomas, Mitchell, Elizabeth J.

“…Energetic particles of magnetospheric origin constantly strike the Earth’s upper atmosphere in the polar regions, producing optical emissions known as the…”
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Shape of the open-closed boundary of the polar cap as determined from observations of precipitating particles by up to four DMSP satellites by Sotirelis, Thomas, Newell, Patrick T., Meng, Ching‐I.

“…The shape of the open–closed boundary is studied using auroral oval crossings from up to four DMSP satellites, providing a maximum eight‐point determination…”
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DMSP observations of high latitude Poynting flux during magnetic storms by Huang, Cheryl Y., Huang, Yanshi, Su, Yi-Jiun, Hairston, Marc R., Sotirelis, Thomas

“…Previous studies have demonstrated that energy can enter the high-latitude regions of the Ionosphere-Thermosphere (IT) system on open field lines. To assess…”
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Science of the Van Allen Probes Science Operations Centers by Manweiler, Jerry W., Breneman, Aaron, Niehof, Jonathan, Larsen, Brian, Romeo, Giuseppe, Stephens, Grant, Halford, Alexa, Kletzing, Craig, Brown, Lawrence E., Spence, Harlan, Reeves, Geoff, Friedel, Reiner, Smith, Sonya, Skoug, Ruth, Blake, Bern, Baker, Dan, Kanekal, Shri, Hoxie, Vaughn, Jaynes, Allison, Wygant, John, Bonnell, John, Crawford, Danielle, Gkioulidou, Matina, Lanzerotti, Louis J., Mitchell, Donald G., Gerrard, Andrew, Ukhorskiy, Aleksandr, Sotirelis, Thomas, Barnes, Robin J., Millan, Robyn, Harris, Blaine

“…The Van Allen Probes mission operations materialized through a distributed model in which operational responsibility was divided between the Mission Operations…”
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Testing the expanding‐contracting polar cap paradigm by Sotirelis, Thomas, Keller, Mary Ruth, Liou, Kan, Smith, Daniel, Barnes, Robin J., Talaat, Elsayed, Baker, Joseph B. H.

“…The expanding‐contracting polar cap (ECPC) paradigm is tested. Under the ECPC paradigm ionospheric convection in the polar cap is driven by the combined…”
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Dawn and dusk sector comparisons of small-scale irregularities, convection, and particle precipitation in the high-latitude ionosphere by Greenwald, Raymond A., Shepherd, Simon G., Sotirelis, Thomas S., Ruohoniemi, J. Michael, Barnes, Robin J.

“…Small‐scale ionospheric irregularities and auroral precipitation are common features of the auroral ionosphere, but their spatial association has not been…”
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Boundary-oriented electron precipitation model by Sotirelis, Thomas, Newell, Patrick T.

“…A boundary‐oriented model of the global configuration of electrons precipitating into the polar ionosphere is presented. It provides the differential energy…”
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Auroral precipitation power during substorms: A Polar UV Imager-based superposed epoch analysis by Newell, Patrick T., Liou, Kan, Sotirelis, Thomas, Meng, Ching‐I.

“…The Polar UV Imager (UVI) is useful both for determining substorm onset times with precision on the order of l min and for making quantitative estimates of…”
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