Results 81 to 90 of about 152,015 (264)

MULTI-WAVELENGTH OBSERVATIONS OF A LARGE SOLAR FLARE

Odessa Astronomical Publications, 2019
We present the results of the multi- wavelength study of the two-ribbon solar flare on July 19, 2000 in the active region NOAA 9087. The evo- lution and morphological properties of the flare pro- ductive active region have been analyzed.
S N. Chornogor, N. N. Kondrashova
doaj   +1 more source

On the Optimal Prediction of Extreme Events in Heavy‐Tailed Time Series With Applications to Solar Flare Forecasting

Journal of Time Series Analysis, EarlyView.
ABSTRACT The prediction of extreme events in time series is a fundamental problem arising in many financial, scientific, engineering, and other applications. We begin by establishing a general Neyman–Pearson‐type characterization of optimal extreme event predictors in terms of density ratios.
Victor Verma, Stilian Stoev, Yang Chen
wiley   +1 more source

Electron acceleration in solar flares [PDF]

Solar Physics, 1989
AbstractFor the period September 1978 to December 1982 we have identified 55 solar flare particle events for which our instruments on board the ISEE-3 (ICE) spacecraft detected electrons above 10 MeV. Combining our data with those from the ULEWAT spectrometer (MPI Garching and University of Maryland) electron spectra in the range from 0.1 to 100 MeV ...
Dan Moses, Wolfgang Dröge, Peter Meyer, P. Evenson   +3 more
openaire   +3 more sources

New classification parameter of solar flares based on the maximum flux in soft X-rays and on duration of flare

, 2020
Solar flare activity is characterised by different classification systems, both in optical and X-ray ranges. The most generally accepted classifications of solar flares describe important parameters of flares such as the maximum of brightness of the ...
Bruevich, Elena
core  

A primitive asteroid that lived fast and died young sampled by a xenolith in the Cold Bokkeveld CM2 carbonaceous chondrite

Meteoritics &Planetary Science, Volume 60, Issue 3, Page 464-483, March 2025.
Abstract Xenoliths in carbonaceous chondrites include lithologies that are unrepresented in the meteorite record and so are a rich source of information on asteroid diversity. Cold Bokkeveld is a CM2 regolith breccia that contains both hydrous and anhydrous lithic clasts. Here, we describe a hydrous clast with a fine‐grained rim.
Martin R. Lee, Cameron J. Floyd, Robin Haller, Sammy Griffin   +3 more
wiley   +1 more source

High-resolution Observations of a C9.3 White-light Flare and Its Impact on the Solar Photosphere

The Astrophysical Journal Letters
We present a detailed analysis of a C9.3 white-light flare using high-resolution observations from the New Vacuum Solar Telescope. The flare occurred near the eastern solar limb on 2023 September 11, within NOAA AR 13431, and produced beam electrons with
Zhe Xu, Xiaoli Yan, Zhentong Li, Liheng Yang, Zhike Xue, Jincheng Wang, Yian Zhou   +6 more
doaj   +1 more source

Experimental simulations of space weathering on pentlandite

Meteoritics &Planetary Science, EarlyView.
Abstract Pentlandite (Fe, Ni)9S8 is an important accessory mineral on asteroidal surfaces. It has been identified in returned regolith samples from asteroids Itokawa, Ryugu, and Bennu. Currently, systematic studies to understand the response of this mineral phase under space weathering conditions are lacking.
L. C. Chaves, M. S. Thompson, C. A. Dukes, M. J. Loeffler, M. F. Martinez‐Motta, H. Vannier, B. H. N. Horgan, N. Smith, K. Ardrey   +8 more
wiley   +1 more source

The White-light Emissions in Two X-class Flares Observed by ASO-S and CHASE

The Astrophysical Journal Letters
The white-light continuum emissions in solar flares (i.e., white-light flares) are usually observed on the solar disk but, in a few cases, off the limb.
Ying Li, Zhichen Jing, De-Chao Song, Qiao Li, Jun Tian, Xiaofeng Liu, Ya Wang, M. D. Ding, Andrea Francesco Battaglia, Li Feng, Hui Li, Weiqun Gan   +11 more
doaj   +1 more source

The Association Between Urbanisation and Household Food Security in Nigeria

Maternal &Child Nutrition, EarlyView.
This paper focuses on the nexus between urbanisation and household food security in the context of Nigeria. The study uses night‐time light intensity as a proxy for urbanisation to capture the variation in urbanisation to estimate its relationship to household food security.
Joseph B. Ajefu, Michael Henry, Sabastine U. Ugbaje   +2 more
wiley   +1 more source

Managing and mitigating future public health risks: Planetary boundaries, global catastrophic risk, and inclusive wealth

Risk Analysis, EarlyView.
Abstract There are two separate conceptualizations for assessing existential risks: Planetary Boundaries (PBs) and global catastrophic risks (GCRs). While these concepts are similar in principle, their underpinning literatures tend not to engage with each other.
Eoin McLaughlin, Matthias Beck
wiley   +1 more source