Search Results - "Heinselman, C J"

Nightside ionospheric electrodynamics associated with substorms: PFISR and THEMIS ASI observations by Zou, S., Lyons, L. R., Nicolls, M. J., Heinselman, C. J., Mende, S. B.

“…Observations from the newly available Poker Flat Incoherent Scatter Radar have been used to study the ionospheric electrodynamics during the substorm expansion…”
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Observations of ionospheric heating during the passage of solar coronal hole fast streams by Sojka, J. J., McPherron, R. L., van Eyken, A. P., Nicolls, M. J., Heinselman, C. J., Kelly, J. D.

“…Using ionospheric temperature measurements made continuously by the Poker Flat Incoherent Scatter Radar (PFISR) and EISCAT Svalbard Radar (ESR) during the…”
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Identification of substorm onset location and preonset sequence using Reimei, THEMIS GBO, PFISR, and Geotail by Zou, S., Moldwin, M. B., Lyons, L. R., Nishimura, Y., Hirahara, M., Sakanoi, T., Asamura, K., Nicolls, M. J., Miyashita, Y., Mende, S. B., Heinselman, C. J.

“…We present state‐of‐the‐art multiple instrument observations of an isolated substorm on October 12, 2007. The auroral breakup was observed simultaneously by…”
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Composite imaging of auroral forms and convective flows during a substorm cycle by Semeter, J., Butler, T. W., Zettergren, M., Heinselman, C. J., Nicolls, M. J.

“…Measurements obtained with the electronically steerable Poker Flat Incoherent Scatter Radar (PFISR) and collocated all‐sky camera were used to construct…”
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Multipoint observations of substorm pre-onset flows and time sequence in the ionosphere and magnetosphere by Shi, Yong, Zesta, Eftyhia, Lyons, L. R., Xing, X., Angelopoulos, V., Donovan, E., McCready, M. A., Heinselman, C. J.

“…In this paper, we use a rare and close longitudinal conjunction of the THEMIS spacecraft with the Sondrestrom radar to present multipoint observations of…”
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Ionospheric convection signatures of tail fast flows during substorms and Poleward Boundary Intensifications (PBI) by Zesta, Eftyhia, Shi, Yong, Donovan, E., Spanswick, E., Lyons, Larry R., Angelopoulos, V., McFadden, J. P., Carlson, C. W., Auster, Hans-Ulrich, Mende, S., McCready, M. A., Heinselman, C. J., Kendall, E., Doe, R.

“…Tail fast flows have been associated both with the onset of substorms and with auroral Poleward Boundary Intensifications (PBIs) that extend equatorward as…”
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Imaging of Polar Mesosphere Summer Echoes with the 450 MHz Poker Flat Advanced Modular Incoherent Scatter Radar by Nicolls, M. J., Heinselman, C. J., Hope, E. A., Ranjan, S., Kelley, M. C., Kelly, J. D.

“…Polar Mesosphere Summer Echoes (PMSE) occur near the mesopause during the polar summer months. PMSE are primarily studied at VHF, however there have been some…”
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Measured and modeled ionospheric densities, temperatures, and winds during the international polar year by Richards, P. G., Nicolls, M. J., Heinselman, C. J., Sojka, J. J., Holt, J. M., Meier, R. R.

“…This paper examines the ability of ionospheric models to reproduce measured electron density, winds, and temperatures during the International Polar Year (IPY)…”
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Momentum flux determination using the multi-beam Poker Flat Incoherent Scatter Radar by NICOLLS, M. J, FRITTS, D. C, JANCHES, D, HEINSELMAN, C. J

“…In this paper, we develop an estimator for the vertical flux of horizontal momentum with arbitrary beam pointing, applicable to the case of arbitrary but fixed…”
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Comparison of AMIE‐modeled and Sondrestrom‐measured Joule heating: A study in model resolution and electric field–conductivity correlation by Cosgrove, R. B., Lu, G., Bahcivan, H., Matsuo, T., Heinselman, C. J., McCready, M. A.

“…Joule heating by high‐latitude ionospheric electric fields is thought to be underestimated by models, and it has been conjectured that the source of the…”
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High time resolution PFISR and optical observations of naturally enhanced ion acoustic lines by MICHELL, R. G, LYNCH, K. A, HEINSELMAN, C. J, STENBAEK-NIELSEN, H. C

“…Observations of naturally enhanced ion acoustic lines (NEIALs) taken with the Poker Flat Incoherent Scatter Radar (PFISR) using a mode with very high time…”
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Persistent enhancement of the HF pump-induced plasma line measured with a UHF diagnostic radar at HAARP by Oyama, S., Watkins, B. J., Djuth, F. T., Kosch, M. J., Bernhardt, P. A., Heinselman, C. J.

“…Plasma lines excited by a powerful, high‐frequency (HF) radio wave are studied using data obtained with an ultrahigh frequency (UHF) radar at HAARP (High…”
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Radio and Meteor Science Outcomes From Comparisons of Meteor Radar Observations at AMISR Poker Flat, Sondrestrom, and Arecibo by Mathews, J. D., Briczinski, S. J., Meisel, D. D., Heinselman, C. J.

“…Radio science and meteor physics issues regarding meteor “head-echo” observations with high power, large aperture (HPLA) radars, include the frequency and…”
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The Chatanika and Sondrestrom Radars – a brief history by McCready, M A, Heinselman, C J

“…The Sondrestrom upper atmospheric research facility, located just north of the Arctic Circle near the west coast of Greenland, will soon celebrate 30 yr of…”
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PFISR nightside observations of naturally enhanced ion acoustic lines, and their relation to boundary auroral features by MICHELL, R. G, LYNCH, K. A, HEINSELMAN, C. J, STENBAEK-NIELSEN, H. C

“…We present results from a coordinated camera and radar study of the auroral ionosphere conducted during March of 2006 from Poker Flat, Alaska. The campaign was…”
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Seasonal Propagation Characteristics of MSTIDs Observed at High Latitudes Over Central Alaska Using the Poker Flat Incoherent Scatter Radar by Negale, M. R., Taylor, M. J., Nicolls, M. J., Vadas, S. L., Nielsen, K., Heinselman, C. J.

“…Near‐continuous electron density measurements obtained over a ∼3 year period, 2010–2013, using the Poker Flat Incoherent Scatter Radar (PFISR) in central…”
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Ion upflow enhanced by drifting F-region plasma structure along the nightside polar cap boundary by Semeter, J., Heinselman, C. J., Thayer, J. P., Doe, R. A., Frey, H. U.

“…Conjugate observations by the incoherent scatter radar at Sondrestrom, Greenland, and the Wideband Imaging Camera (WIC) on the IMAGE satellite have been used…”
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High-time resolution dayside convection monitoring by incoherent scatter radar and a sample application by Zou, S., Lyons, L. R., McCready, M. A., Heinselman, C. J.

“…Convection and its changes, driven by the solar wind, are related to geomagnetic disturbances such as substorms, dynamic pressure disturbances and convection…”
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Ionospheric response to wave-accelerated electrons at the poleward auroral boundary by Semeter, J., Heinselman, C. J., Sivjee, G. G., Frey, H. U., Bonnell, J. W.

“…The local ionospheric response to an auroral intensification at the poleward auroral boundary has been investigated using the incoherent scatter radar (ISR)…”
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A high-latitude observation of sporadic sodium and sporadic E-layer formation by Heinselman, C. J., Thayer, J. P., Watkins, B. J.

“…High‐resolution radar and lidar measurements of sporadic sodium (Na) and sporadic E (E) layers were made at the Sondrestrom incoherent‐scatter radar facility…”
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