Results 41 to 50 of about 527 (105)

Simulation study for ground-based Ku-band microwave observations of ozone and hydroxyl in the polar middle atmosphere [PDF]

Atmospheric Measurement Techniques, 2019
The Ku-band microwave frequencies (10.70–14.25 GHz) overlap emissions from ozone (O3) at 11.072 GHz and hydroxyl radical (OH) at 13.441 GHz.
D. A. Newnham, M. A. Clilverd, M. Kosch, M. Kosch, A. Seppälä, P. T. Verronen   +5 more
doaj   +1 more source

What is the solar influence on climate? Overview of activities during CAWSES-II [PDF]

, 2014
This paper presents an overview of the main advances in the Key Questions identified by the Task Group ‘What is the Solar Influence on Climate’ by the SCOSTEP CAWSES-II science program.
Matthes, Katja, Mironova, I., Randall, C., Seppälä, A.   +3 more
core   +1 more source

Impact of EMIC‐wave driven electron precipitation on the radiation belts and the atmosphere [PDF]

, 2021
In recent years there has been a growing body of direct experimental evidence demonstrating electromagnetic ion cyclotron (EMIC) waves driving energetic electron precipitation (EEP) at unexpectedly low, sub‐MeV energies — as low as only a few hundred keV.
Clilverd, M.A., Hendry, A.T., Rodger, C.J., Seppälä, A.   +3 more
core   +1 more source

Response of the low-latitude D region ionosphere to extreme space weather event of 14–16 December 2006 [PDF]

, 2015
The response of the D region low-latitude ionosphere has been examined for extreme space weather event of 14–16 December 2006 associated with a X1.5 solar flare and an intense geomagnetic storm (Dst = 146 nT) using VLF signals from Northwest Cape ...
Kumar, Abhikesh, Kumar, Sushil, Maurya, A.K., Menk, Frederick, Singh, Rajesh, Veenadhari, Bhasakara   +5 more
core   +1 more source

Techniques to determine the quiet day curve for a long period of subionospheric VLF observations [PDF]

, 2015
Very low frequency (VLF) transmissions propagating between the conducting Earth's surface and lower edge of the ionosphere have been used for decades to study the effect of space weather events on the upper atmosphere.
Clilverd, Mark A., Cresswell-Moorcock, Kathy, Milling, David K., Rodger, Craig J.   +3 more
core   +1 more source

Energetic electron precipitation and auroral morphology at the substorm recovery phase [PDF]

, 2017
18th EISCAT symposiumSession E6: The ERG mission and magnetosphere-ionosphere couplingMay 26 (Fri), NIPR ...

core   +2 more sources

Energetic particle precipitation: A major driver of the ozone budget in the Antarctic upper stratosphere [PDF]

, 2016
Geomagnetic activity is thought to affect ozone and, possibly, climate in polar regions via energetic particle precipitation (EPP) but observational evidence of its importance in the seasonal stratospheric ozone variation on long time scales is still ...
Alessandro Damiani, Bernd Funke, Manuel López Puertas, Michelle L. Santee, Raul R. Cordero, Shingo Watanabe   +5 more
core   +1 more source

Exceptional middle latitude electron precipitation detected by balloon observations: implications for atmospheric composition [PDF]

, 2021
Energetic particle precipitation leads to ionization in the Earth\u27s atmosphere, initiating the formation of active chemical species which destroy ozone and have the potential to impact atmospheric composition and dynamics down to the troposphere.
Bazilevskaya, Galina, Clilverd, Mark, Funke, Bernd, Makhmutov, Vladimir, Mironova, Irina, Rozanov, Eugene, Santee, Michelle L., Sinnhuber, Miriam, Sukhodolov, Timofei   +8 more
core   +2 more sources

Quantitative analysis of nighttime effects of radiation belt energetic electron precipitation on the D-region ionosphere during lower solar activity periods [PDF]

Atmospheric Chemistry and Physics
Energetic electron precipitation (EEP) from the Earth's radiation belts can ionize neutral molecules in the D-region ionosphere (60–90 km altitude), significantly influencing the conductivity and chemical species therein.
X. Dong, X. Dong, X. Dong, S. Zhao, S. Zhao, S. Zhao, L. Liao, W. Xu, R. Lin, R. Lin, R. Lin, X. Sun, S. Huang, S. Huang, S. Huang, Y. Cui, Y. Cui, J. Li, J. Li, J. Li, H. Lu, X. Shen, X. Shen, X. Shen   +23 more
doaj   +1 more source

Late Ediacaran Redox Stability and Metazoan Evolution [PDF]

, 2013
The Neoproterozoic arrival of animals fundamentally changed Earth's biological and geochemical trajectory. Since the early description of Ediacaran and Cambrian animal fossils, a vigorous debate has emerged about the drivers underpinning their seemingly ...
Bekker, A., Goldberg, T., Johnston, David T, Knoll, Andrew Herbert, Podkovyrov, V., Poulton, S. W., Sergeev, V. N., Vorob’eva, N. G.   +7 more
core   +1 more source