Explanipedia

A Compact Full-disk Solar Magnetograph based on miniaturization of GONG instrument Open

Sanjay Gosain, Jack Harvey, V. Mártínez Pillet, T. N. Woods, F. Hill · 2022

Designing compact instruments is the key for the scientific exploration by smaller spacecrafts such as cubesats or by deep space missions. Such missions require compact instrument designs to have minimal instrument mass. Here we present a …

Continuous Solar Observations from the Ground—Assessing Duty Cycle from GONG Observations Open

Kiran Jain, S. C. Tripathy, F. Hill, Alexei Pevtsov · 2021

Continuous observations play an important role in the studies of solar variability. While such observations can be achieved from space with almost 100% duty cycle, it is difficult to accomplish very high duty cycle from the ground. In this…

Historical astronomical data: urgent need for preservation, digitization\n enabling scientific exploration Open

Alexei Pevtsov, Elizabeth Griffin, J. E. Grindlay, S. Kafka, Jennifer Bartlett , et al. · 2019

Over the past decades and even centuries, the astronomical community has\naccumulated a signif-icant heritage of recorded observations of a great many\nastronomical objects. Those records con-tain irreplaceable information about\nlong-term…

The Global Oscillation Network Group Facility—An Example of Research to Operations in Space Weather Open

F. Hill · 2018

The Global Oscillation Network Group (GONG) is a system of ground‐based solar observing stations distributed geographically so that the Sun is visible nearly continuously at all times. Originally developed to provide data for research into…

The Sun's Seismic Radius as Measured from the Fundamental Modes of Oscillations and Its Implications for the TSI Variations Open

Kiran Jain, S. C. Tripathy, F. Hill · 2018

In this Letter we explore the relationship between the solar seismic radius and total solar irradiance (TSI) during the last two solar cycles using the uninterrupted data from space-borne instruments on board the Solar and Heliospheric Obs…

22 Year Solar Magnetic Cycle and its relation to Convection Zone Dynamics Open

Kiran Jain, S. C. Tripathy, R. Komm, F. Hill, R. Simoniello · 2018

Using continuous observations for 22 years from ground-based network GONG and space-borne instruments MDI onboard SoHO and HMI onboard SDO , we report both global and local properties of the convection zone and their variations with time.

Probing Subsurface Flows in NOAA Active Region 12192: Comparison with NOAA 10486 Open

Kiran Jain, S. C. Tripathy, F. Hill · 2017

NOAA Active Region (AR) 12192 is the biggest AR observed in solar cycle 24 so far. This was a long-lived AR that survived for four Carrington rotations (CRs) and exhibited several unusual phenomena. We measure the horizontal subsurface flo…

A study of acoustic halos in active region NOAA 11330 using multi-height SDO observations Open

S. C. Tripathy, Kiran Jain, S. Kholikov, F. Hill, S. P. Rajaguru , et al. · 2017

TEMPORAL EVOLUTION OF CHROMOSPHERIC OSCILLATIONS IN FLARING REGIONS: A PILOT STUDY Open

Teresa Monsue, F. Hill, Keivan G. Stassun · 2016

We have analyzed H α intensity images obtained at a 1 minute cadence with the Global Oscillation Network Group (GONG) system to investigate the properties of oscillations in the 0–8 mHz frequency band at the location and time of strong M- …

A NEW CHALLENGE TO SOLAR DYNAMO MODELS FROM HELIOSEISMIC OBSERVATIONS: THE LATITUDINAL DEPENDENCE OF THE PROGRESSION OF THE SOLAR CYCLE Open

R. Simoniello, S. C. Tripathy, Kiran Jain, F. Hill · 2016

The onset of the solar cycle at mid-latitudes, the slowdown in the drift of sunspots toward the equator, the tail-like attachment, and the overlap of successive cycles at the time of minimum activity are delicate issues in models of the α …

HORIZONTAL FLOWS IN ACTIVE REGIONS FROM RING-DIAGRAM AND LOCAL CORRELATION TRACKING METHODS Open

Kiran Jain, S. C. Tripathy, B. Ravindra, R. Komm, F. Hill · 2015

Continuous high-cadence and high spatial resolution Dopplergrams allow us to study subsurface dynamics that may be further extended to explore precursors of visible solar activity on the surface. Since the p -mode power is absorbed in the …

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