E-Print Archive

There are 4172 abstracts currently viewable.


Advanced Search
Main Page Add New E-Print Submitter
News Help/FAQ About Preferences
Manage Key Phrase
Frequency-Distance Structure of Solar Radio Sources Observed by LOFAR View all abstracts by submitter

Mykola Gordovskyy   Submitted: 2019-03-12 08:49

Low-frequency radio observations make it possible to study the solar corona at distances up to 2-3 R. Frequency of plasma emission is a proxy for electron density of the emitting plasma and, therefore, observations of solar radio bursts can be used to probe the density structure of the outer corona. In this study, positions of solar radio sources are investigated using the Low-Frequency Array (LOFAR) spectral imaging in the frequency range 30-50 MHz. We show that there are events where apparent positions of the radio sources cannot be explained using the standard coronal density models. Namely, the apparent heliocentric positions of the sources are 0.1-0.7 R further from the Sun compared with the positions predicted by the Newkirk model, and these shifts are frequency-dependent. We discuss several possible explanations for this effect, including enhanced plasma density in the flaring corona, as well as scattering and refraction of the radio waves.

Authors: Mykola Gordovskyy, Eduard Kontar, Philippa Browning, and Alexey Kuznetsov
Projects: LOw Frequency ARray (LOFAR)

Publication Status: published
Last Modified: 2019-03-12 23:29
Go to main E-Print page  Inference of magnetic field strength and density from damped transverse coronal waves  The birth of a coronal mass ejection  Edit Entry  Download Preprint  Delete Entry 

Go to main E-Print pageGo to main E-Print page.
Previous AbstractPrevious Abstract.
Next AbstractNext Abstract.
Download PreprintDownload Preprint.
Submitter's HomepageSubmitters Homepage.
Edit EntryEdit Entry.
View All Abstracts By SubmitterView all abstracts by submitter.
Delete AbstractDelete abstract.

Latest Entries
The Distribution of Time Delays Between Nanoflares in Magnetohydrodynamic Simulations
Data-driven MHD Simulation of the Formation and Initiation of a Large-scale Pre-flare Magnetic Flux Rope in Solar Active Region 12371
NVST observations of collision-induced apparent fan-shaped jets
Cosmic ray interactions in the solar atmosphere
A correlation in the waiting-time distributions of solar flares
Alternative Models of Zebra Patterns in the Event on June 21, 2011
Torsional slow-mode oscillations discovered in the magnetic free energy during solar flares
Particle acceleration in coalescent and squashed magnetic islands II. Particle-In-cell approach
The time step constraint in radiation hydrodynamics
Continuous Null-Point Magnetic Reconnection Builds Up a Torus Unstable Magnetic Flux Rope Triggering the X9.3 Flare in Solar Active Region~12673
A Comparison of Flare Forecasting Methods. IV. Evaluating Consecutive-Day Forecasting Patterns
The New 2018 Version of the Meudon Spectroheliograph
Longitudinal filament oscillations enhanced by two C-class flares
Spatio-temporal energy partitioning in a non-thermally dominated two-loop solar flare
Meteospace, a New Instrument for Solar Survey at the Calern Observatory
Correcting the effect of magnetic tongues on the tilt angle of bipolar active regions
Hi-C 2.1 Observations of Jetlet-like Events at Edges of Solar Magnetic Network Lanes
Fine-scale Explosive Energy Release at Sites of Prospective Magnetic Flux Cancellation in the Core of the Solar Active Region Observed by Hi-C 2.1, IRIS, and SDO
Remote coronal dimmings related to a circular-ribbon flare
Formation and Eruption of a Mini-sigmoid Originating in Coronal Hole

Related Pages
MSU Solar Physics.
Max Millennium Science Mail Archive.
Max Millennium Message of the Day Mail Archive.
Max Millennium Flare Catalog

Archive Maintainer
Alisdair Davey

© 2003 Solar Physics Group - Montana State University