Results 41 to 50 of about 115 (102)

Sun-as-a-star variability of Hα and Ca II 854.2 nm lines

Frontiers in Astronomy and Space Sciences
Studies of stellar magnetic fields mostly rely on proxies derived from chromospheric lines, typically forming in the UV and shorter wavelengths and therefore accessible only from space based observatories.
Garrett Zills, Serena Criscuoli, Luca Bertello, Alexei Pevtsov   +3 more
doaj   +1 more source

Forecasting Coronal Mass Ejections Using Transformers: A Comparative Study of Flare‐Associated Versus Flare‐Independent Approaches

Space Weather, Volume 23, Issue 8, August 2025.
Abstract Forecasting coronal mass ejections (CMEs) remains a challenge, and no reliable, accurate forecasting method has yet been developed. Knowing that CMEs can occur in association with flares, we compare two approaches: (a) forecasting CMEs by coupling to flare forecasting, and (b) forecasting CMEs independently of flare occurrence.
Julio Hernandez Camero, Lucie M. Green
wiley   +1 more source

Latitude Quenching Nonlinearity in the Solar Dynamo

The Astrophysical Journal
We compare two candidate nonlinearities for regulating the solar cycle within the Babcock–Leighton paradigm: tilt quenching (whereby the tilt of active regions is reduced in stronger cycles) and latitude quenching (whereby flux emerges at higher ...
Anthony R. Yeates, Luca Bertello, Alexander A. Pevtsov, Alexei A. Pevtsov   +3 more
doaj   +1 more source

The Solar Activity Monitor Network – SAMNet

Journal of Space Weather and Space Climate, 2022
The Solar Activity Magnetic Monitor (SAMM) Network (SAMNet) is a future UK-led international network of ground-based solar telescope stations. SAMNet, at its full capacity, will continuously monitor the Sun’s intensity, magnetic, and Doppler velocity ...
Erdélyi Robertus, Korsós Marianna B., Huang Xin, Yang Yong, Pizzey Danielle, Wrathmall Steven A., Hughes Ifan G., Dyer Martin J., Dhillon Vikram S., Belucz Bernadett, Brajša Roman, Chatterjee Piyali, Cheng Xuewu, Deng Yuanyong, Domínguez Santiago Vargas, Joya Raúl, Gömöry Peter, Gyenge Norbert G., Hanslmeier Arnold, Kucera Ales, Kuridze David, Li Faquan, Liu Zhong, Xu Long, Mathioudakis Mihalis, Matthews Sarah, McAteer James R.T., Pevtsov Alexei A., Pötzi Werner, Romano Paolo, Shen Jinhua, Temesváry János, Tlatov Andrey G., Triana Charles, Utz Dominik, Veronig Astrid M., Wang Yuming, Yan Yihua, Zaqarashvili Teimuraz, Zuccarello Francesca   +39 more
doaj   +1 more source

First Observations of a Geomagnetic Superstorm With a Sub‐L1 Monitor

Space Weather, Volume 23, Issue 3, March 2025.
Abstract Forecasting the geomagnetic effects of solar coronal mass ejections (CMEs) is currently an unsolved problem. CMEs, responsible for the largest values of the north‐south component of the interplanetary magnetic field, are the key driver of intense and extreme geomagnetic activity.
E. Weiler, C. Möstl, E. E. Davies, A. M. Veronig, U. V. Amerstorfer, T. Amerstorfer, J. Le Louëdec, M. Bauer, N. Lugaz, V. Haberle, H. T. Rüdisser, S. Majumdar, M. Reiss   +12 more
wiley   +1 more source

Preliminary Results on Irradiance Measurements from Lyra and Swap

Advances in Astronomy, Volume 2012, Issue 1, 2012., 2012
The first and preliminary results of the photometry of Large Yield Radiometer (LYRA) and Sun Watcher using Active Pixel system detector and Image Processing (SWAP) onboard PROBA2 are presented in this paper. To study the day‐to‐day variations of LYRA irradiance, we have compared the LYRA irradiance values (observed Sun as a star) measured in Aluminum ...
S. T. Kumara, R. Kariyappa, M. Dominique, D. Berghmans, L. Damé, J. F. Hochedez, V. H. Doddamani, Lakshmi Pradeep Chitta, J. Javaraiah   +8 more
wiley   +1 more source

Design of the microelectromechanical logic element based on a comb-drive resonator

Научно-технический вестник информационных технологий, механики и оптики
CMOS technology has nearly reached the physical limits of transistor scaling and exhibits significant operational limitations at extreme temperatures and ionizing radiation.
A. A. Solovev, E. F. Pevtsov, V. A. Kolchuzhin   +2 more
doaj   +1 more source

Preface to the special issue on “Old records for new knowledge”

Geoscience Data Journal, Volume 11, Issue 4, Page 357-364, October 2024.
Studying a changing world requires observations going back in time to extend and contextualize our latest scientific knowledge. Old legacy data exist in non‐digital formats. Thus, techniques and methodologies for the preservation, dissemination, interpretation, homogenization, calibration, and use of such legacy data and their associated metadata, as ...
Josep Batlló, Hisashi Hayakawa, Victoria Slonosky, Richard I. Crouthamel   +3 more
wiley   +1 more source

Dynamics of Subsurface Flows in Solar Active Regions during the 2024 May Storm

The Astrophysical Journal
In 2024 May, the Sun exhibited intense magnetic activity, marked by numerous high-intensity flares resulting from the interaction and merging of NOAA active regions (ARs) 13664 and 13668 in the southern hemisphere and AR 13663 in the northern hemisphere.
B. Lekshmi, Sushanta Tripathy, Kiran Jain, Alexei Pevtsov   +3 more
doaj   +1 more source

System-Level Mathematical Macro-Models of Logic MEMS Gates

Доклады Белорусского государственного университета информатики и радиоэлектроники
The relevance of the study is due to the rapid development of microelectromechanical systems (MEMS), which are used as logic elements due to low power consumption, high reliability and the ability to reprogram during operation.
А. А. Solovev, E. F. Pevtsov, V. A. Kolchuzhin   +2 more
doaj   +1 more source