Search Results - "Engebretson, Mark J"

Wave-induced loss of ultra-relativistic electrons in the Van Allen radiation belts by Shprits, Yuri Y., Drozdov, Alexander Y., Spasojevic, Maria, Kellerman, Adam C., Usanova, Maria E., Engebretson, Mark J., Agapitov, Oleksiy V., Zhelavskaya, Irina S., Raita, Tero J., Spence, Harlan E., Baker, Daniel N., Zhu, Hui, Aseev, Nikita A.

“…The dipole configuration of the Earth’s magnetic field allows for the trapping of highly energetic particles, which form the radiation belts. Although…”
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The Combined Influence of Lower Band Chorus and ULF Waves on Radiation Belt Electron Fluxes at Individual L‐Shells by Simms, Laura E., Engebretson, Mark J., Rodger, Craig J., Dimitrakoudis, Stavros, Mann, Ian. R., Chi, Peter J.

“…We investigate the timing and relative influence of VLF in the chorus frequency range observed by the DEMETER spacecraft and ULF wave activity from ground…”
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Confirmation of EMIC wave‐driven relativistic electron precipitation by Hendry, Aaron T., Rodger, Craig J., Clilverd, Mark A., Engebretson, Mark J., Mann, Ian R., Lessard, Marc R., Raita, Tero, Milling, David K.

“…Electromagnetic ion cyclotron (EMIC) waves are believed to be an important source of pitch angle scattering driven relativistic electron loss from the…”
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Survey of the Frequency Dependent Latitudinal Distribution of the Fast Magnetosonic Wave Mode from Van Allen Probes Electric and Magnetic Field Instrument and Integrated Science Waveform Receiver Plasma Wave Analysis by Boardsen, Scott A., Hospodarsky, George B., Kletzing, Craig A., Engebretson, Mark J., Pfaff, Robert F., Wygant, John R., Kurth, William S., Averkamp, Terrance F., Bounds, Scott R., Green, Jim L., De Pascuale, Sebastian

“…We present a statistical survey of the latitudinal structure of the fast magnetosonic wave mode detected by the Van Allen Probes spanning the time interval of…”
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Modeling the Effects of Drift Shell Splitting in Two Case Studies of Simultaneous Observations of Substorm‐Driven Pi1B and IPDP‐Type EMIC Waves by Salzano, Michelle, Lessard, Marc R., Noh, Sungjun, Kim, Hyomin, Waters, Colin, Engebretson, Mark J., Horne, Richard, Clilverd, Mark, Kadokura, Akira, Tanaka, Yoshimasa, Kim, Khan‐Hyuk, Matzka, Jürgen, Fromm, Tanja, Goldstein, Jerry, Kim, Myeong Joon

“…Intervals of pulsations of diminishing periods (IPDPs) are a subtype of electromagnetic ion cyclotron (EMIC) waves that can be triggered by substorm onset…”
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Ground‐Based Observations of VLF Waves as a Proxy for Satellite Observations: Development of Models Including the Influence of Solar Illumination and Geomagnetic Disturbance Levels by Simms, Laura E., Engebretson, Mark J., Clilverd, Mark A., Rodger, Craig J.

“…Ground observations of VLF (very low frequency) waves have often been used to infer VLF activity in the magnetosphere; however, they are not an unbiased…”
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Energetic Proton Spectra Measured by the Van Allen Probes by Summers, Danny, Shi, Run, Engebretson, Mark J., Oksavik, Kjellmar, Manweiler, Jerry W., Mitchell, Donald G.

“…We test the hypothesis that pitch angle scattering by electromagnetic ion cyclotron (EMIC) waves can limit ring current proton fluxes. For two chosen magnetic…”
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Investigating the IMF cone angle control of Pc3-4 pulsations observed on the ground by Bier, Elianna A., Owusu, Nana, Engebretson, Mark J., Posch, Jennifer L., Lessard, Marc R., Pilipenko, Viacheslav A.

“…Many studies have shown that Pc3‐4 pulsations (~0.014–0.1 Hz) observed in Earth's magnetosphere during daytime hours originate in the ion foreshock region of…”
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Fast‐moving diffuse auroral patches: A new aspect of daytime Pc3 auroral pulsations by Motoba, Tetsuo, Ebihara, Yusuke, Kadokura, Akira, Engebretson, Mark J., Lessard, Marc R., Weatherwax, Allan T., Gerrard, Andrew J.

“…Auroral pulsations are a convenient diagnostic of wave‐particle interactions in the magnetosphere. A case study of a daytime Pc3 (22–100 mHz) auroral pulsation…”
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Solar cycle dependence of ion cyclotron wave frequencies by Lessard, Marc R., Lindgren, Erik A., Engebretson, Mark J., Weaver, Carol

“…Electromagnetic ion cyclotron (EMIC) waves have been studied for decades, though remain a fundamentally important topic in heliospheric physics. The connection…”
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Near-Earth initiation of a terrestrial substorm by Rae, I. Jonathan, Mann, Ian R., Angelopoulos, Vassilis, Murphy, Kyle R., Milling, David K., Kale, Andy, Frey, Harald U., Rostoker, Gordon, Russell, Christopher T., Watt, Clare E. J., Engebretson, Mark J., Moldwin, Mark B., Mende, Stephen B., Singer, Howard J., Donovan, Eric F.

“…Despite the characterization of the auroral substorm more than 40 years ago, controversy still surrounds the processes triggering substorm onset initiation…”
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Low Frequency ULF Waves in the Earth’s Inner Magnetosphere: Power Spectra During High Speed Streams and Quiet Solar Wind and Seeding of EMIC Waves by Gamayunov, Konstantin V., Engebretson, Mark J.

“…Here we extend the scope of the Gamayunov and Engebretson (2021, hereinafter Paper 1) work by analyzing the low frequency ultra-low-frequency (ULF) wave power…”
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Low Frequency ULF Waves in the Earth's Inner Magnetosphere: Statistics During Coronal Mass Ejections and Seeding of EMIC Waves by Gamayunov, Konstantin V., Engebretson, Mark J.

“…Here we perform a statistical analysis of low frequency ultra‐low‐frequency (ULF) waves (∼ mHz ‐ Hz) in the Earth's inner magnetosphere excluding…”
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Classifier Neural Network Models Predict Relativistic Electron Events at Geosynchronous Orbit Better than Multiple Regression or ARMAX Models by Simms, Laura E., Engebretson, Mark J.

“…To find the best method of predicting when daily relativistic electron flux (>2 MeV) will rise at geosynchronous orbit, we compare model predictive success…”
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Magnetosphere–Ionosphere Drivers of Transient‐Large‐Amplitude Geomagnetic Disturbances: Statistical Analysis and Event Study by McCuen, Brett A., Moldwin, Mark B., Engebretson, Mark J., Weygand, James M., Nishimura, Yukitoshi

“…We present a comprehensive statistical analysis of high‐frequency transient‐large‐amplitude (TLA) magnetic perturbation events that occurred at 12…”
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Automated High‐Frequency Geomagnetic Disturbance Classifier: A Machine Learning Approach to Identifying Noise While Retaining High‐Frequency Components of the Geomagnetic Field by McCuen, Brett A., Moldwin, Mark B., Steinmetz, Erik S., Engebretson, Mark J.

“…We present an automated method to identify high‐frequency geomagnetic disturbances in ground magnetometer data and classify the events by the source of the…”
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EMIC Waves in the Earth's Inner Magnetosphere as a Function of Solar Wind Structures During Solar Maximum by Gamayunov, Konstantin V., Engebretson, Mark J., Elkington, Scot R.

“…Here we analyze the statistics of electromagnetic ion cyclotron (EMIC) waves observed in the Earth's inner magnetosphere during coronal mass ejection (CME),…”
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Searching for ULF signatures of the cusp: Observations from search coil magnetometers and auroral imagers in Svalbard by Engebretson, Mark J., Moen, Joran, Posch, Jennifer L., Lu, Fei, Lessard, Marc R., Kim, Hyomin, Lorentzen, Dag A.

“…Spacecraft traveling through the cusp at a variety of altitudes have consistently found the cusp to be filled with intense, often irregular power in the upper…”
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Extreme Geomagnetic Disturbances (GMDs) Observed in Eastern Arctic Canada: Occurrence Characteristics and Solar Cycle Dependence by Engebretson, Mark J., Yang, Lily, Steinmetz, Erik S., Pilipenko, Vyacheslav A., Moldwin, Mark B., McCuen, Brett A., Connors, Martin G., Weygand, James M., Waters, Colin L., Nishimura, Yukitoshi, Lyons, Larry R., Russell, Christopher T.

“…Extreme (>20 nT/s) geomagnetic disturbances (GMDs, also denoted as MPEs—magnetic perturbation events)—impulsive nighttime disturbances with time scale…”
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Empirical predictive models of daily relativistic electron flux at geostationary orbit: Multiple regression analysis by Simms, Laura E., Engebretson, Mark J., Pilipenko, Viacheslav, Reeves, Geoffrey D., Clilverd, Mark

“…The daily maximum relativistic electron flux at geostationary orbit can be predicted well with a set of daily averaged predictor variables including previous…”
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