Results 41 to 50 of about 2,926 (125)

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

First limits on the 3-200 keV X-ray spectrum of the quiet Sun using RHESSI [PDF]

, 2007
We present the first results using the Reuven Ramaty High-Energy Solar Spectroscopic Imager, RHESSI, to observe solar X-ray emission not associated with active regions, sunspots or flares (the quiet Sun).
Dolan J. F., G. J. Hurford, H. S. Hudson, I. G. Hannah, K. van Bibber, Peterson L. E., R. P. Lin, Strong K. T.   +7 more
core   +1 more source

Spectral magnetic helicity of solar active regions between 2006 and 2017

, 2019
We compute magnetic helicity and energy spectra from about 2485 patches of about 100 megameters (Mm) side length on the solar surface using data from Hinode during 2006--2017. An extensive database is assembled where we list magnetic energy and helicity,
Brandenburg, Axel, Gosain, Sanjay
core   +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

Large Scale Soft X-ray Loops And Their Magnetic Chirality In Both Hemispheres

, 2010
The magnetic chirality in solar atmosphere has been studied based on the soft X-ray and magnetic field observations. It is found that some of large-scale twisted soft X-ray loop systems occur for several months in the solar atmosphere, before the ...
Gao, Yu, Kuzanyan, K., Sokoloff, D. D., Su, Jiangtao, Yang, Shangbin, Zhang, Hongqi   +5 more
core   +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

Constraining the X-ray Luminosities of Asymptotic Giant Branch Stars: TX Cam and T Cas

, 2004
To probe the magnetic activity levels of asymptotic giant branch (AGB) stars, we used XMM-Newton to search for X-ray emission from two well-studied objects, TX Cam and T Cas.
Kastner, Joel H., Soker, Noam
core   +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

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