Solar Physics
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#1J. PalaciosH-Index: 5
#2Dominik Utz (University of Graz)H-Index: 9
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A joint campaign of various space-borne and ground-based observatories, comprising the Japanese Hinode mission (Hinode Observing Plan 338, 20 – 30 September 2017), the GREGOR solar telescope, and the Vacuum Tower Telescope (VTT), investigated numerous targets such as pores, sunspots, and coronal holes. In this study, we focus on the coronal hole region target. On 24 September 2017, a very extended non-polar coronal hole developed patches of flux emergence, which contributed to the decrease of th...
#1Douglas F. da Silva (Mackenzie Presbyterian University)H-Index: 1
#2Paulo J. A. Simões (Glas.: University of Glasgow)H-Index: 13
Last. Adriana Valio (Mackenzie Presbyterian University)H-Index: 5
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Polarisation measurements of solar flares at millimetre-waves were used to investigate the magnetic field configuration of the emitting sources. We analyse two solar flares (SOL2013-02-17 and SOL2013-11-05) observed by the POlarisation Emission of Millimetre Activity at the Sun (POEMAS) at 45 and 90 GHz, at microwaves from 1 – 15 GHz by the Radio Solar Telescope Network (RSTN), and at high frequencies (212 GHz) by the Solar Submillimetre Telescope (SST). Also, hard X-rays from these flares were ...
#1Gilbert Pi (Charles University in Prague)H-Index: 5
#2Alexander Pitňa (Charles University in Prague)H-Index: 3
Last. Y. H. Yang (NCU: National Central University)H-Index: 10
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High-speed streams (HSSs) are believed to be only slightly affected by different interactions on their path from the Sun to Earth and thus the analysis of their observations can provide information on the structure and temporal variations of the magnetic field and plasma parameters at the source region. We have chosen three coronal holes supplying 14 HSSs recorded by Wind in 2008. For each HSS, we have calculated the average magnetic field and plasma parameters as well as power spectral densitie...
#1Munetoshi Tokumaru (Nagoya University)H-Index: 26
#2Kaito Tawara (Nagoya University)
Last. Toshio TerasawaH-Index: 24
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Observations of the Crab pulsar at 327 MHz were made at the Toyokawa Observatory of the Institute for Space-Earth Environmental Research, during the solar occultation in mid-June 2018 to investigate the coronal plasma density in the weak sunspot cycle, Cycle 24. The dispersion measurements (DMs) were determined using giant pulses detected from observations of the Crab pulsar. The systematic increase in DM over the background level, observed during the period of the closest approach of the Crab p...
#2V. M. S. CarrascoH-Index: 9
Last. José M. VaqueroH-Index: 23
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More than 140 isolated non-recurrent geomagnetic storms (GMSs) of various intensities from extreme to weak are considered; these are reliably identified with solar eruptive sources (coronal mass ejections, CMEs). The analysis aims to obtain a possibly complete picture of the relationship between the transit time of propagation of CMEs and interplanetary coronal mass ejections (ICMEs) from the Sun to the Earth (more precisely, the time interval \Delta t_{p}from the moment of an eruption until ...
#1A. López-Comazzi (University of Alcalá)
Last. Juan José Blanco (University of Alcalá)H-Index: 8
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Neutron monitor counting rates and solar wind velocity, interplanetary magnetic field, sunspot number and total solar irradiance measurements from 2013 to 2018 corresponding to the end of solar maximum and the decreasing phase of the Solar Cycle 24 have been used. The main objective is to check whether the periodicities observed in the cosmic rays are affected by the magnetic rigidity or the height at which the neutron monitors are placed. A Global Neutron Monitor (GNM) has been defined as repre...
#1Pooja Devi (Kumaun University)
#2Bhuwan Joshi (PRL: Physical Research Laboratory)H-Index: 14
Last. Reetika Joshi (Kumaun University)H-Index: 3
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We study a complex GOES M1.1 circular ribbon flare and related pre-flare activity on 26 January 2015 [SOL2015-01-26T16:53] in the solar active region NOAA 12268. This flare activity was observed by the Atmospheric Imaging Assembly (AIA) on board Solar Dynamics Observatory (SDO) and the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI). The examination of photospheric magnetograms during the extended period, prior to the event, suggests the successive development of a so-called “anemo...
#1R. P. Lepping (UMBC: University of Maryland, Baltimore County)H-Index: 1
#1R. P. LeppingH-Index: 71
Last. Adam Szabo (GSFC: Goddard Space Flight Center)H-Index: 41
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We give the results of parameter fitting of the magnetic clouds (MCs) observed by the Wind spacecraft for the three year period – 2004 to the end of 2006 (the “Present period”) using the force-free MC model of Lepping, Jones, and Burlaga (J. Geophys. Res.95, 11957, 1990). There were 19 MCs identified in the Present period, which was mainly in the declining phase of the solar cycle. The long-term occurrence rate of MCs is 10.3/year (1995-2015), whereas the occurrence rate for the Present period i...
#1Taesam Lee (Gyeongsang National University)H-Index: 14
The prediction of a time series such as climate indices and the sunspot number (SSN) with long-term oscillatory behaviors has been a challenging task due to the complex combination of oscillations. Frequency extraction algorithms have been developed to separate a time series into different oscillation components according to frequency, such as empirical model decomposition (EMD) and wavelet analysis. In the current study, the deep learning long short-term memory (LSTM) model was employed to pred...
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Solar flare