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Metric Type II Radio Emission associated with Coronal Mass Ejections of Large Angular Widths: Some New Insights
Mayank Rajput, Susanta Kumar Bisoi, Janardhan Padmanabhan
Solar Type II radio bursts are manifestations of shocks produced by explosive and eruptive solar activities, such as solar flares and coronal mass ejections (CMEs). Metric range or…
Radio Wave Propagation as a Probe of the Solar Corona and Solar Wind
K. Sasikumar Raja, Prasad Subramanian, Susanta Kumar Bisoi +3
Radio waves propagating through an inhomogeneous, turbulent medium such as the solar corona and solar wind become distorted, causing the initially plane wavefronts becomes corrugat…
Prolonged and Extremely Non-radial Solar Wind Flows
Susanta Kumar Bisoi, Diptiranjan Rout, P. Janardhan +3
We present a study of three highly non-radial solar wind events when the azimuthal solar wind flow angle exceeds > 6 degrees for one day or more. None of the events are associated…
Solar Flare Prediction Using Magnetic Field Diagnostics Above the Photosphere
M. B. Korsos, M. K. Georgoulis, N. Gyenge +7
In this article, we present the application of the weighted horizontal gradient of magnetic field (WGM) flare prediction method to 3-dimensional (3D) extrapolated magnetic configur…
A new tool for predicting the solar cycle: Correlation between flux transport at the equator and the poles
Susanta Kumar Bisoi, P. Janardhan
The magnetic flux cancellation on the Sun plays a crucial role in determining the manner in which the net magnetic flux changes in every solar cycle, affecting the large scale evol…
Another Mini Solar Maximum in the Offing: A Prediction for the Amplitude of Solar Cycle 25
Susanta Kumar Bisoi, P. Janardhan, S. Ananthakrishnan
We examine the temporal changes in both solar polar magnetic field (PMF) at latitudes and heliospheric magnetic field (HMF) at 1 AU during solar cycles 21--24 wi…
Beyond the mini-solar maximum of solar cycle 24: Declining solar magnetic fields and the response of the terrestrial magnetosphere
M. Ingale, P. Janardhan, S. K. Bisoi
The present study examines the response of the terrestrial magnetosphere to the long-term steady declining trends observed in solar magnetic fields and solar wind micro-turbulence…
Global Solar Magnetic-field and Interplanetary Scintillations During the Past Four Solar Cycles
K. Sasikumar Raja, P. Janardhan, Susanta Kumar Bisoi +4
The extended minimum of Solar Cycle 23, the extremely quiet solar-wind conditions prevailing, and the mini-maximum of Solar Cycle 24 drew global attention and many authors have sin…
Decimetric emission 500 away from a flaring Site: Possible scenarios from solar radio observations
Susanta Kumar Bisoi, H. S. Sawant, P. Janardhan +5
We present a study of decimetric radio activity, using the first high time cadence (0.5 s) images from the () at 610 M…
Solar cycle 24: an unusual polar field reversal
P. Janardhan, K. Fujiki, M. Ingale +2
Aims: To investigate solar polar fields during cycle 24, using measurements of solar magnetic fields in the latitude range 55 - 90 degree and 78 - 90 degree, to report a prolonged…
A Twenty Year Decline in Solar Photospheric Magnetic Fields: Inner-Heliospheric Signatures and Possible Implications?
P. Janardhan, Susanta Kumar Bisoi, S. Ananthakrishnan +4
We report observations of a steady 20 year decline of solar photospheric fields at latitudes 45 starting from 1995. This prolonged and continuing decline, combi…
A study of density modulation index in the inner heliospheric solar wind during solar cycle 23
Susanta Kumar Bisoi, P. Janardhan, M. Ingale +4
The ratio of the rms electron density fluctuations to the background density in the solar wind (density modulation index, ) is of vital importance in understan…
Changes in quasi-periodic variations of solar photospheric fields: precursor to the deep solar minimum in the cycle 23?
Susanta Kumar Bisoi, P. Janardhan, D. Chakrabarty +2
Using both wavelet and Fourier analysis, a study has been undertaken of the changes in the quasi-periodic variations in solar photospheric fields in the build-up to one of the deep…
The Prelude to the Deep Minimum between Solar Cycles 23 and 24: Interplanetary Scintillation Signatures in the Inner Heliosphere
P. Janardhan, Susanta Kumar Bisoi, S. Ananthakrishnan +2
Extensive interplanetary scintillation (IPS) observations at 327 MHz obtained between 1983 and 2009 clearly show a steady and significant drop in the turbulence levels in the entir…