NDLI: The Dynamic Spectrum of Interplanetary Scintillation: First Solar Wind Observations on LOFAR

Content Provider	Springer Nature Link
Author	Fallows, R. A. Asgekar, A. Bisi, M. M. Breen, A. R. ter Veen, S.
Copyright Year	2012
Abstract	The LOw Frequency ARray (LOFAR) is a next-generation radio telescope which uses thousands of stationary dipoles to observe celestial phenomena. These dipoles are grouped in various ‘stations’ which are centred on the Netherlands with additional ‘stations’ across Europe. The telescope is designed to operate at frequencies from 10 to 240 MHz with very large fractional bandwidths (25 – 100 %). Several ‘beam-formed’ observing modes are now operational and the system is designed to output data with high time and frequency resolution, which are highly configurable. This makes LOFAR eminently suited for dynamic spectrum measurements with applications in solar and planetary physics. In this paper we describe progress in developing automated data analysis routines to compute dynamic spectra from LOFAR time–frequency data, including correction for the antenna response across the radio frequency pass-band and mitigation of terrestrial radio-frequency interference (RFI). We apply these data routines to observations of interplanetary scintillation (IPS), commonly used to infer solar wind velocity and density information, and present initial science results.
Starting Page	127
Ending Page	139
Page Count	13
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	285
Issue Number	1-2
e-ISSN	1573093X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-04-24
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Radio scintillation Solar wind Astrophysics and Astroparticles Atmospheric Sciences Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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Equatorwards Expansion of Unperturbed, High-Latitude Fast Solar Wind

Heliolatitude and Time Variations of Solar Wind Structure from in situ Measurements and Interplanetary Scintillation Observations

Detection of Solar Wind Disturbances: Mexican Array Radio Telescope IPS Observations at 140 MHz

Interplanetary and Ionosphere Scintillation Monitoring of Radio Sources Ensemble at the Solar Activity Minimum

Reconstruction of Helio-Latitudinal Structure of the Solar Wind Proton Speed and Density

Interplanetary Scintillation Observations of Stream Interaction Regions in the Solar Wind

Relation Between Coronal Hole Areas and Solar Wind Speeds Derived from Interplanetary Scintillation Measurements

Interplanetary Scintiallation (IPS) of the Radio Source 3C48 During Periods of Low and High Solar Activity

3D Reconstruction of Interplanetary Scintillation (IPS) Remote-Sensing Data: Global Solar Wind Boundaries for Driving 3D-MHD Models

The Dynamic Spectrum of Interplanetary Scintillation: First Solar Wind Observations on LOFAR

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Equatorwards Expansion of Unperturbed, High-Latitude Fast Solar Wind

Heliolatitude and Time Variations of Solar Wind Structure from in situ Measurements and Interplanetary Scintillation Observations

Detection of Solar Wind Disturbances: Mexican Array Radio Telescope IPS Observations at 140 MHz

Interplanetary and Ionosphere Scintillation Monitoring of Radio Sources Ensemble at the Solar Activity Minimum

Reconstruction of Helio-Latitudinal Structure of the Solar Wind Proton Speed and Density

Interplanetary Scintillation Observations of Stream Interaction Regions in the Solar Wind

Relation Between Coronal Hole Areas and Solar Wind Speeds Derived from Interplanetary Scintillation Measurements

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The Dynamic Spectrum of Interplanetary Scintillation: First Solar Wind Observations on LOFAR