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The index of scintillation measurement is a good parameter to compare different sites for image quality or ‘seeing’.We have developed a scintillometer, which is deployed on the high resolution SPAR te...
Observational Study of Solar Magnetic Active Phenomena
Sun: activity flares magnetic fields
2010/9/17
The electric current separated into two parts reflected the quantative properties of heterogeneity and chirality of magnetic field, and defined them as the shear and twist components of current. We an...
Research Facilities for Solar Astronomy at ARIES
Sun telescope coelostat solar activity CCD V++
2010/9/16
The solar observational facilities at ARIES (erstwhile U.P. State Observatory, UPSO), Nainital, began in the sixties with the acquisition of two moderate sized (25 cm, f/66 off-axis Skew Cassegrain an...
Design and Status of SolarVector Magnetograph (SVM-I) at Udaipur Solar Observatory
Sun: polarimetry Fabry Perot solar magnetic fields
2010/9/16
We present the status of the instrument called SolarVector Magnetograph Phase-I (SVM-I) currently being developed at Udaipur Solar Observatory. SVM-I is an instrument which aims to determine the magne...
The Flares Associated with the Dynamics of the Sunspots
Sunspots rotation magnetic flux magnetic reconnection
2010/9/16
In the present study, we consider six years data of spot groups that have well developed leading and following spots obtained from the Kodaikanal Observatory white light pictures and occurrence of Hα ...
Extremely Energetic 4B/X17.2 Flare and Associated Phenomena
Sun: Flares coronal mass ejections reconnection
2010/9/16
We observed 4B/X17.2 flare in Hα from super-active region NOAA 10486 at ARIES, Nainital. This is one of the largest flares of current solar cycle 23, which occurred near the Sun’s center and produced ...
Photospheric, Chromospheric and Helioseismic Signatures of a Large Flare in Super-active Region NOAA 10486
Solar flares flare trigger ring diagram
2010/9/16
NOAA 10486 produced several powerful flares, including the 4B/X17.2 superflare of October 28, 2003/11:10 UT. This flare was extensively covered by the Hα and GONG instruments operated at the Udaipur S...
I summarize the statistical, physical, and morphological properties of coronal mass ejections (CMEs) of solar cycle 23, as observed by the Solar and Heliospheric Observatory (SOHO) mission. The SOHO d...
The Challenge of Predicting the Occurrence of Intense Storms
Sun coronal mass ejection geomagnetic storms space weather
2010/9/16
Geomagnetic super-storms of October and November 2003 are compared in order to identify solar and interplanetary variables that influence the magnitude of geomagnetic storms. Although these superstorm...
Geo-effectiveness of Solar Wind Extremes
Geomagnetic storms geomagnetic activity solar wind streams interplanetary magnetic field space weather
2010/9/16
Examples of extreme events of solar wind and their effect on geomagnetic conditions are discussed here. It is found that there are two regimes of high speed solar wind streams with a threshold ofͬ...
Enigmatic SolarWind Disappearance Events – DoWe Understand Them?
Solar wind disappearance polar field reversals transient coronal holes active regions
2010/9/16
At the Sun–Earth distance of one astronomical unit (1AU),the solar wind is known to be strongly supersonic and super Alfv´enic with Mach and Alfv´en numbers being on average 12 and 9 respe...
EUV and Coronagraphic Observations of Coronal Mass Ejections
Sun corona coronal mass ejections post-eruptive arcades filaments prominence
2010/9/16
The Large Angle Spectrometric Coronagraph (LASCO)and Extreme-ultraviolet Imaging Telescope (EIT) onboard Solar and Heliospheric Observatory (SOHO) provide us with unprecedented multiwavelength observa...
Initiation of CMEs by Magnetic Flux Emergence
Sun: corona coronal mass ejections magnetic fields magnetohydrodynamics flux emergence
2010/9/16
The initiation of solar Coronal Mass Ejections (CMEs) is studied in the framework of numerical magnetohydrodynamics (MHD).The initial CME model includes a magnetic flux rope in spherical, axisymmetric...
North–South Distribution of Solar Flares during Cycle 23
activity flares north south asymmetry
2010/9/16
In this paper, we investigate the spatial distribution of solar flares in the northern and southern hemispheres of the Sun that occurred during the period 1996 to 2003. This period of investigation in...
Magnetic Source Regions of Coronal Mass Ejections
Coronal mass ejection flare filament eruption
2010/9/16
The majority of flare activity arises in active regions which contain sunspots, while Coronal Mass Ejection (CME) activity can also originate from decaying active regions and even so-called quiet sola...