Results 41 to 50 of about 15,398 (201)

The administrator, teachers and parents involvement in preschool during Movement Control Order [PDF]

, 2021
The Covid-19 pandemic is affecting the whole education system including the preschoolers in Malaysia in receiving a proper teaching and learning lesson especially in the classroom. Movement Control Order (MCO) implemented by the government has restricted
Halim, Harliana, Senin, Muhammad Adam
core   +1 more source

Quantitative Evaluation of Energy Coupling between Quasi-Periodic Substorms and High-Speed Coronal Streams [PDF]

Journal of Astronomy and Space Sciences, 2008
It has been known that high-speed solar wind streams associated with coronal holes lead to quasi-periodic substorms that occur approximately every 2˜4 hours.
M. Y. Park, D.-Y. Lee, K. C. Kim, C. R. Choi, K. S. Park   +4 more
doaj   +1 more source

From physics of polar aurora to changes of the fundamental approaches to the physics of the magnetospheric processes

Frontiers in Astronomy and Space Sciences, 2022
One of the main problems of modern magnetospheric physics is the lack of a self-consistent explanation of the main physical processes based on the laws of plasma physics.
Elizaveta E. Antonova, Elizaveta E. Antonova   +1 more
doaj   +1 more source

Evolution of Energetic Proton Parallel Pressure Anisotropy at Geosynchronous Altitudes: Potential Role in Triggering Substorm Expansion Phase Onset

Geophysical Research Letters
The sequence of events associated with the triggering of energy release during substorm expansion phase onset is still not well‐understood. Oberhagemann and Mann (2020b, https://doi.org/10.1029/2019gl085271) proposed a new substorm onset mechanism, where
S. S. Babu, I. R. Mann, S. Dimitrakoudis, L. G. Ozeke, I. J. Rae, C. Forsyth, A. W. Smith   +6 more
doaj   +1 more source

Dawn‐Side Anomaly in Sudden Geomagnetic Field Responses to Solar Wind Pressure Discontinuities During the 10 May and 10 October 2024 Geomagnetic Storms

Geophysical Research Letters, Volume 53, Issue 3, 16 February 2026.
Abstract Interactions of solar wind dynamic pressure (SWDP) discontinuities with Earth's magnetosphere cause geomagnetic Sudden Commencements (SCs). Typically, positive/negative SCs occur at low latitudes due to enhancements/reductions in SWDP.
Deeksha Rai, S. Tulasi Ram, B. Nilam, D. M. Oliveira, B. Remya, Anil Raghav, D. Chakrabarty, Abhishek Kumar, Shivam Parashar, Vipin K. Yadav, A. P. Dimri   +10 more
wiley   +1 more source

The Shock‐Substorm of 24 September 1998: A Different Type of Substorm Trigger Onset

Geophysical Research Letters
An interplanetary shock triggered a substorm with a peak intensity SML = −1,781 nT on 24 September 1998. This is called a shock‐substorm here to differentiate it from generic substorms.
Bruce T. Tsurutani, Rajkumar Hajra, Yusuke Ebihara, Gurbax S. Lakhina, Yasuhito Narita, Karl‐Heinz Glassmeier   +5 more
doaj   +1 more source

Uncovering the Generation Mechanism of Low‐Frequency Chorus Waves (<0.1 fce_eq ${\boldsymbol{f}}_{\mathbf{c}\mathbf{e}\mathbf{\_}\mathbf{e}\mathbf{q}}$) During Active Geomagnetic Environments

Geophysical Research Letters, Volume 53, Issue 3, 16 February 2026.
Abstract Low‐frequency chorus waves (below 0.1 fce_eq ${f}_{\text{ce}\_\text{eq}}$, where fce_eq ${f}_{\text{ce}\_\text{eq}}$ is equatorial electron gyrofrequency) can induce the depletion of relativistic electrons in Earth's radiation belts by effective pitch angle scattering, demonstrating distinct effects on radiation belt dynamics compared to ...
Xuan Zhou, Xinliang Gao, Dedong Wang, Jiuqi Ma, Quanming Lu   +4 more
wiley   +1 more source

A Novel Magnetosphere–Ionosphere Coupling Model for the Onset of Substrom Expansion Phase

Frontiers in Astronomy and Space Sciences, 2021
A novel magnetosphere–ionosphere (M-I) coupling model is proposed to simulate the brightening of the onset auroral arc of a magnetospheric substorm event.
P. S. Wang, L. H. Lyu
doaj   +1 more source

Solar wind-magnetosphere coupling and the distant magnetotail: ISEE-3 observations [PDF]

, 1985
ISEE-3 Geotail observations are used to investigate the relationship between the interplanetary magnetic field, substorm activity, and the distant magnetotail.
Akasofu, S. I., Baker, D. N., Lepping, R. P., Sibeck, D. G., Slavin, J. A., Smith, E. J., Zwickl, R. D.   +6 more
core   +1 more source

The Dominant Role of the Electron Isotropy Boundary in Controlling Earth's Outer Radiation Belt Electron Lifetimes

Geophysical Research Letters, Volume 53, Issue 3, 16 February 2026.
Abstract Field‐line curvature scattering (FLCS) is believed to be the primary mechanism forming electron isotropy boundaries (IB) and can rapidly scatter relativistic electrons from the outer radiation belt. However, its direct and quantitative impact on controlling outer belt electron lifetimes has never been directly assessed.
Man Hua, Xiaofei Shi, Jacob Bortnik, Anton Artemyev, Vassilis Angelopoulos, Yoshizumi Miyoshi, Takefumi Mitani, James L. Burch, Takeshi Takashima, Tomoaki Hori, Ayako Matsuoka, Mariko Teramoto, Kazuhiro Yamamoto, Yoshiya Kasahara, Fuminori Tsuchiya, Atsushi Kumamoto, Atsuki Shinbori, Iku Shinohara   +17 more
wiley   +1 more source