Search Results - "Kosch, Michael J"

Evidence for stratospheric sudden warming effects on the upper thermosphere derived from satellite orbital decay data during 1967-2013 by Yamazaki, Yosuke, Kosch, Michael J., Emmert, John T.

“…We investigate possible impact of stratospheric sudden warmings (SSWs) on the thermosphere by using long‐term data of the global average thermospheric total…”
Get full text

The altitude of sprites observed over South Africa by Mashao, Dakalo C, Kosch, Michael J, Bór, Jozsef, Nnadih, Stanislaus

“…Sprites are mesospheric optical emissions that are mostly produced by large, positive cloud-to-ground lightning discharges. Sprites appear in different…”
Get full text

Quasi‐biennial oscillation of the ionospheric wind dynamo by Yamazaki, Yosuke, Liu, Huixin, Sun, Yang‐Yi, Miyoshi, Yasunobu, Kosch, Michael J., Mlynczak, Martin G.

“…The interannual variation of the ionospheric solar quiet (Sq) current system is examined. A dense magnetometer network over Japan enables the accurate…”
Get full text

The equatorial electrojet during geomagnetic storms and substorms by Yamazaki, Yosuke, Kosch, Michael J.

“…The climatology of the equatorial electrojet during periods of enhanced geomagnetic activity is examined using long‐term records of ground‐based magnetometers…”
Get full text

The geospace response to variable inputs from the lower atmosphere: a review of the progress made by Task Group 4 of CAWSES-II by Oberheide, Jens, Shiokawa, Kazuo, Gurubaran, Subramanian, Ward, William E, Fujiwara, Hitoshi, Kosch, Michael J, Makela, Jonathan J, Takahashi, Hisao

“…The advent of new satellite missions, ground-based instrumentation networks, and the development of whole atmosphere models over the past decade resulted in a…”
Get full text

Aspect angle sensitivity of pump-induced optical emissions at EISCAT by Kosch, Michael J, Bryers, Carl, Rietveld, Michael T, Yeoman, Timothy K, Ogawa, Yasunobu

“…We investigate the aspect angle sensitivity of the pump-induced artificial optical emissions in the ionosphere over the European Incoherent Scatter Scientific…”
Get full text

Large-scale coordinated observations of Pc5 pulsation events by Mtumela, Zolile, Walker, Anthony D M, Stephenson, Judy A E, Kosch, Michael J

“…HF (high-frequency) radars belonging to SuperDARN (Super Dual Auroral Radar Network) receive backscatter over substantial fields of view which, when combined,…”
Get full text

Global Simulations of Multi‐Frequency HF Signal Absorption for Direct Observation of Middle Atmosphere Temperature and Composition by Mahmoudian, Alireza, Kosch, Michael J., Baghaei, Reza Mohammadi

“…This paper presents the first numerical study on a new concept for the direct measurement of D‐region absorption in the high‐frequency (HF) band. Numerical…”
Get full text

First Observations of E‐Region Near Range Echoes Partially Modulated by F‐Region Traveling Ionospheric Disturbances Observed by the Same SuperDARN HF Radar by Hiyadutuje, Alicreance, Kosch, Michael J., Stephenson, Judy A. E.

“…We present the first observations from SuperDARN HF radar data of E‐region Near Range Echoes (NREs) whose amplitudes are partially modulated by Medium‐Scale…”
Get full text

Simultaneous Occurrence of Traveling Ionospheric Disturbances, Farley Buneman and Gradient Drift Instabilities Observed by the Zhongshan SuperDARN HF Radar by Hiyadutuje, Alicreance, Habarulema, John Bosco, Kosch, Michael J., Chen, Xiangcai, Stephenson, Judy A. E., Matamba, Tshimangadzo Merline

“…We show that Traveling Ionospheric Disturbances (TIDs) may affect the Farley Buneman Instability (FBI) and Gradient Drift Instability (GDI) echoes referred to…”
Get full text

Dynamic Properties of a Sporadic Sodium Layer Revealed by Observations Over Zhongshan, Antarctica: A Case Study by Chen, Xiangcai, Huang, Wentao, Ban, Chao, Kosch, Michael J., Murphy, Damian J., Hu, Zejun, Liu, Jianjun, He, Fang, Wang, Rui, Yang, Huigen, Hu, Hongqiao

“…A sodium Doppler lidar system with three‐directional measurements of sodium density, atmospheric wind field, and temperature was established at Zhongshan…”
Get full text

A model of high-latitude thermospheric density by Yamazaki, Yosuke, Kosch, Michael J., Sutton, Eric K.

“…We present an empirical model of the high‐latitude air density at 450 km, derived from accelerometer measurements by the CHAllenging Minisatellite Payload and…”
Get full text

North-south asymmetry of the high-latitude thermospheric density: IMF BY effect by Yamazaki, Yosuke, Kosch, Michael J., Sutton, Eric K.

“…Previous studies have established that the y component of the interplanetary magnetic field (IMF By) plays a role in the north‐south asymmetry of the…”
Get full text

Ionospheric electron number densities from CUTLASS dual‐frequency velocity measurements using artificial backscatter over EISCAT by Sarno‐Smith, Lois K., Kosch, Michael J., Yeoman, Timothy, Rietveld, Michael, Nel, Amore', Liemohn, Michael W.

“…Using quasi‐simultaneous line‐of‐sight velocity measurements at multiple frequencies from the Hankasalmi Cooperative UK Twin Auroral Sounding System (CUTLASS)…”
Get full text

Observation of sporadic E layer altitude partially modulated by the Traveling Ionospheric Disturbances at high latitudes over Zhongshan station by Hiyadutuje, Alicreance, Kosch, Michael J., Habarulema, John Bosco, Chen, Xiangcai, Stephenson, Judy A.E., Matamba, Tshimangadzo Merline, Tshisaphungo, Mpho

“…At Zhongshan (69° S, 76° E) Antarctica we investigate the sporadic E (Es)-layer virtual height modulation, observed by an ionosonde, during the passage of the…”
Get full text

Simultaneous Observations of a Sporadic E Layer by Digisonde and SuperDARN HF Radars at Zhongshan, Antarctica by Chen, Xiangcai, Liu, Jianjun, Kosch, Michael J., Hu, Zejun, Wang, Zhiwei, Zhang, Beichen, Yang, Huigen, Hu, Hongqiao

“…Sporadic E (Es) layers could be composed of metallic ions and formed, modified, or transported by the action of convective electric fields in the high latitude…”
Get full text

North‐south asymmetry of the high‐latitude thermospheric density: IMF B Y effect by Yamazaki, Yosuke, Kosch, Michael J., Sutton, Eric K.

“…Abstract Previous studies have established that the y component of the interplanetary magnetic field (IMF B y ) plays a role in the north‐south asymmetry of…”
Get full text

High-latitude Geospace Environment studied by Incoherent Scatter Radars by Kosch, Michael J.

Get full text

A New Technique for Investigating Dust Charging in the PMSE Source Region by Mahmoudian, Alireza, Kosch, Mike J., Vierinen, Juha, Rietveld, Michael T.

“…A new technique for investigating dust charging in the PMSE (polar mesospheric summer echoes) source region is proposed and discussed in this paper. The first…”
Get full text

North-south asymmetry of the high-latitude thermospheric density: IMF B sub(Y) effect by Yamazaki, Yosuke, Kosch, Michael J, Sutton, Eric K

“…Previous studies have established that the y component of the interplanetary magnetic field (IMF B sub(y)) plays a role in the north-south asymmetry of the…”
Get full text