Results 41 to 50 of about 638 (150)

X-RAY RADIANCE AND MAGNETIC FLUX

Soft X-ray and magnetic field observations of the Sun (quiet Sun, X-ray bright points, active regions, and integrated solar disk) and active stars (dwarf and pre–main-sequence) that were used in Figure 1 in Pevtsov et al (2003) in their study of X-ray ...
Pevtsov, Alexei
core   +2 more sources

The Faraday Effect Tracker of Coronal and Heliospheric Structures (FETCH) instrument

Frontiers in Astronomy and Space Sciences, 2023
There continue to be open questions regarding the solar wind and coronal mass ejections (CMEs). For example: how do magnetic fields within CMEs and corotating/stream interaction regions (CIRs/SIRs) evolve in the inner heliosphere?
Elizabeth A. Jensen, Nat Gopalswamy, Lynn B. Wilson, Lan K. Jian, Shing F. Fung, Teresa Nieves-Chinchilla, Marta Shelton, Lihua Li, Manohar Deshpande, Lloyd Purves, Joseph Lazio, Ward B. Manchester, Brian E. Wood, Jason E. Kooi, David B. Wexler, Stuart Bale, Alexei Pevtsov, Bernard V. Jackson, Kenny N. Kenny   +18 more
doaj   +1 more source

Identifying and Predicting Coronal Mass Ejection Occurrence: Observational Checklists for Space Weather Forecasters

Space Weather, Volume 24, Issue 6, June 2026.
Abstract Ejections of magnetized plasma from the Sun, known as coronal mass ejections, can drive major geomagnetic activity if Earth‐directed, and are therefore monitored by space weather forecasters. The current focus being the forecast of the arrival time of a coronal mass ejection at Earth and the level of geomagnetic impact.
L. M. Green, A. W. James, N. Ngampoopun, S. L. Yardley, K. Waite, E. K. Mottram, J. Hernandez Camero, J. O'kane   +7 more
wiley   +1 more source

Solar Sources of Interplanetary Magnetic Clouds Leading to Helicity Prediction

Space Weather, Volume 16, Issue 11, Page 1668-1685, November 2018., 2018
Abstract This study identifies the solar origins of magnetic clouds that are observed at 1 AU and predicts the helical handedness of these clouds from the solar surface magnetic fields. We started with the magnetic clouds listed by the Magnetic Field Investigation (MFI) team supporting NASA's Wind spacecraft in what is known as the MFI table and worked
Roger K. Ulrich, Pete Riley, T. Tran
wiley   +1 more source

Reconstructing Historical Solar Indices for Predicting Past Space Weather Events

Space Weather, Volume 24, Issue 4, April 2026.
Abstract Modeling and forecasting the near‐Earth space environment, specifically the thermosphere, is particularly important because it affects the motion of low‐Earth orbit objects through atmospheric drag. Solar indices such as F10.7, S10.7, M10.7, and Y10.7 are commonly used as inputs to ionospheric and thermospheric density models.
Poshan Belbase, Denny M. Oliveira, Theodosios Chatzistergos, Gangkai Poh, Eftyhia Zesta   +4 more
wiley   +1 more source

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

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