Results 71 to 80 of about 781,821 (303)

Radar Observations of 8.3-m scale equatorial spread F irregularities over Trivandrum [PDF]

Annales Geophysicae, 2004
In this paper, we present observations of equatorial spread F (ESF) irregularities made using a newly installed 18MHz radar located at Trivandrum. We characterize the morphology and the spectral parameters of the 8.3-m ESF irregularities which are ...
D. Tiwari, A. K. Patra, C. V. Devasia, R. Sridharan, N. Jyoti, K. S. Viswanathan, K. S. V. Subbarao   +6 more
doaj   +1 more source

Quantitative estimates of relationships between geomagnetic activity and equatorial spread-F as determined by TID occurrence levels [PDF]

, 2000
Using a world-wide set of stations for 15 years, quantitative estimates of changes to equatorial spread-F (ESF) occurrence rates obtained from ionogram scalings, have been determined for a range of geomagnetic activity (GA) levels, as well as for four ...
B G Fejer, B G Fejer, D L Hysell, E J Weber, F E Croxton, G F Deminova, G G Bowman, G G Bowman, G G Bowman, G G Bowman, G G Bowman, G G Bowman, G G Bowman, G G Bowman, G G Bowman, G G Bowman, G Rostoker, G S Sales, J H Sastri, J P Flaherty, J Rottger, J W Wright, K S V Subbarao, L A Hajkowicz, L Scherliess, M C Kelley, M C Kelley, M C Kelley, P E Argo, R G Rastogi, S Singh, S Singh   +31 more
core   +2 more sources

Mapping the evolution of mitochondrial complex I through structural variation

FEBS Letters, EarlyView.
Respiratory complex I (CI) is crucial for bioenergetic metabolism in many prokaryotes and eukaryotes. It is composed of a conserved set of core subunits and additional accessory subunits that vary depending on the organism. Here, we categorize CI subunits from available structures to map the evolution of CI across eukaryotes. Respiratory complex I (CI)
Dong‐Woo Shin, Tingting Chen, James A. Letts   +2 more
wiley   +1 more source

Multi-station investigation of spread F over Europe during low to high solar activity

Journal of Space Weather and Space Climate, 2018
Spread F is an ionospheric phenomenon which has been reported and analyzed extensively over equatorial regions on the basis of the Rayleigh-Taylor (R-T) instability.
Paul Krishnendu Sekhar, Haralambous Haris, Oikonomou Christina, Paul Ashik, Belehaki Anna, Ioanna Tsagouri, Kouba Daniel, Buresova Dalia   +7 more
doaj   +1 more source

A study of the conditions necessary for the onset of mid-latitude spread F [PDF]

Ionospheric conditions associated with the initiation of spread F in the mid-latitude ionosphere were observed. The morphology of spread F at Puerto Rico was investigated.
Zinchenko, G. N.
core   +1 more source

Summary of Sessions: Ionosphere - Thermosphere - Mesosphere Working Group [PDF]

, 2006
The topics covered by the sessions under the working group on Ionosphere-Thermosphere-Mesosphere dealt with various aspects of the response of the ionosphere-thermosphere coupled system and the middle atmosphere to solar variability.
Bhattacharyya, A., Spann, J. F.
core   +1 more source

Spatiotemporal and quantitative analyses of phosphoinositides – fluorescent probe—and mass spectrometry‐based approaches

FEBS Letters, EarlyView.
Fluorescent probes allow dynamic visualization of phosphoinositides in living cells (left), whereas mass spectrometry provides high‐sensitivity, isomer‐resolved quantitation (right). Their synergistic use captures complementary aspects of lipid signaling. This review illustrates how these approaches reveal the spatiotemporal regulation and quantitative
Hiroaki Kajiho, Shin Morioka, Junko Sasaki, Takehiko Sasaki   +3 more
wiley   +1 more source

LTE-Advanced Downlink Throughput Evaluation In The 3G And TV White Space Bands [PDF]

, 2013
To maintain a high quality of service to the increasing number of smartphone users, additional spectrum is required. The TV white space bands provide a good opportunity to achieve this goal.
Andrew R. Nix, Angela Doufexi, Araz S. Ameen, Evangelos Mellios, Naim Dahnoun   +4 more
core   +2 more sources

Protein pyrophosphorylation by inositol pyrophosphates — detection, function, and regulation

FEBS Letters, EarlyView.
Protein pyrophosphorylation is an unusual signaling mechanism that was discovered two decades ago. It can be driven by inositol pyrophosphate messengers and influences various cellular processes. Herein, we summarize the research progress and challenges of this field, covering pathways found to be regulated by this posttranslational modification as ...
Sarah Lampe, Tanmay Kumar Mohanty, Rashna Bhandari, Dorothea Fiedler   +3 more
wiley   +1 more source

A model for equatorial explosive spread F

Geophysical Research Letters, 1984
Explosive spread F was first described by Woodman and LaHoz [1976]. In such events the 50 MHz radar signal rises at Jicamarca to 10‐20 db above the noise level within a few milliseconds but then disappears within 100 ms or less. Woodman has suggested that electric fields from thunderstorms might drive a plasma instability which could cause these echoes,
M. C. Kelley, D. T. Farley, E. Kudeki, C. L. Siefring   +3 more
openaire   +1 more source