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Investigation of two coronal mass ejections from circular ribbon source region:Origin,Sun-Earth propagation and Geoeffectiveness

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Research in Astronomy and Astrophysics 2021年第12期21卷 531-549页

作者： M.Syed Ibrahim Wahab Uddin Bhuwan Joshi Ramesh Chandra Arun Kumar Awasthi aryabhatta research institute of observational sciences nainital 263002 india kodaikanal solar observatory indian institute of astrophysicskodaikanal-624103tamil naduindia udaipur solar observatory physical research laboratoryudaipur 313004india department of physics dsb campuskumaun universitynainital 263002india cas key laboratory of geospace environment department of geophysics and planetary sciencesuniversity of science and technology of chinahefei 230026china

In this article,we compare the properties of two coronal mass ejections(CMEs)that show similar source region characteristics but different evolutionary behaviors in the later *** discuss the two events in terms of their near-Sun characteristics,interplanetary evolution and *** carefully analyzed the initiation and propagation parameters of these events to establish the precise CMEinterplanetary CME(ICME)connection and their near-Earth *** first event is associated with poor geomagnetic storm disturbance index(Dst≈-20 n T)while the second event is associated with an intense geomagnetic storm of DST≈-119 n *** configuration of the sunspots in the active regions and their evolution are observed by Helioseismic and Magnetic Imager(HMI).For source region imaging,we rely on data obtained from Atmospheric Imaging Assembly(AIA)on board solar Dynamics observatory(SDO)and Hαfiltergrams from the solar Tower Telescope at Aryabhatta Research Institute of Observational Sciences(ARIES).For both the CMEs,flux rope eruptions from the source region triggered flares of similar intensities(≈M1).At the solar source region of the eruptions,we observed a circular ribbon flare(CRF)for both cases,suggesting fan-spine magnetic configuration in the active region *** multi-channel SDO observations confirm that the eruptive flares and subsequent CMEs were intimately related to the filament *** the Large Angle and Spectrometric Coronograph(LASCO)field of view(FOV)the two CMEs propagated with linear speeds of 671 and 631 km s-1,*** CMEs were tracked up to the Earth by solar Terrestrial Relations observatory(STEREO)*** find that the source region evolution of CMEs,guided by the large-scale coronal magnetic field configuration,along with near-Sun propagation characteristics,such as CME-CME interactions,played important roles in deciding the evolution of CMEs in the interplanetary medium and subsequently their geoeffec

关键词： Sun:coronal mass ejections(CMEs) Sun:flares

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Variation of Small Scale Magnetic Fields Over a Century using Ca-K Images as Proxy

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Research in Astronomy and Astrophysics 2023年第4期23卷 172-183页

作者： Jagdev Singh Muthu Priyal B.Ravindra Luca Bertello Alexei Pevtsov Indian Institute of Astrophysics II BlockKoramangalaBengaluru–560034India National solar observatory 3365 Discovery DriveThird FloorBoulderCO 80303USA

A combined uniform and long-time series of Ca-K images from the kodaikanal observatory,Mount Wilson observatory and Mauna Loa solar observatory was used to identify and study the Ca-K small-scale features and their solar cycle variations over a *** small scale features are classified into three distinct categories:enhanced network,active network and quiet *** these features show that their areas vary according to the11 yr solar *** relative amplitude of the Ca-K network variations agrees with that of the sunspot *** total area of these small-scale features varies from about 5%during the minimum phase of the solar cycle to about20%during its maximum phase.

关键词： Sun activity-Sun chromosphere-(Sun:)sunspots

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