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A very rapid Extreme Scattering Event in the IDV source 0954+658
Astrophysics · Submitted 24 Oct 2001
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim During an Intraday Variability (IDV) monitoring project (March 2000), a feature resembling an ESE-like event appeared in the variable light curve of 0954+658, however with a time scale of less than two days.
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The abstract, sentence by sentence
Extreme Scattering Events (ESEs) are dramatic variations of the flux density at Gigahertz frequencies caused by ray path distortions within an isolated inhomogeneity ("plasma lens") in the interstellar medium. These events are characterized by a deep flux density minimum in the light curve with, in some cases, surrounding maxima. The variability time scales range from weeks to months. These phenomena show a strong frequency dependence, in which the variability amplitudes increase with wavelength. During an Intraday Variability (IDV) monitoring project (March 2000), a feature resembling an ESE-like event appeared in the variable light curve of 0954+658, however with a time scale of less than two days. We will discuss this effect and its implications for a better description of the interstellar medium.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Extreme Scattering Events (ESEs) are dramatic variations of the flux density at Gigahertz frequencies caused by ray path distortions within an isolated inhomogeneity ("plasma lens") in the interstellar medium. | background 1.00 | 0.05 | 0.03 | asserted 1.00 |
| s1 | These events are characterized by a deep flux density minimum in the light curve with, in some cases, surrounding maxima. | background 1.00 | 0.06 | 0.03 | asserted 0.93 |
| s2 | The variability time scales range from weeks to months. | background 1.00 | 0.07 | 0.03 | asserted 1.00 |
| s3 | These phenomena show a strong frequency dependence, in which the variability amplitudes increase with wavelength. | background 1.00 | 0.09 | 0.04 | asserted 1.00 |
| s4 | During an Intraday Variability (IDV) monitoring project (March 2000), a feature resembling an ESE-like event appeared in the variable light curve of 0954+658, however with a time scale of less than two days. | result 0.96 | 0.95 | 0.34 | asserted 0.93 |
| s5 | We will discuss this effect and its implications for a better description of the interstellar medium. | future work 0.80 | 0.30 | 0.10 | unclear 0.94 |
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The paper
Original abstract
Extreme Scattering Events (ESEs) are dramatic variations of the flux density at Gigahertz frequencies caused by ray path distortions within an isolated inhomogeneity ("plasma lens") in the interstellar medium. These events are characterized by a deep flux density minimum in the light curve with, in some cases, surrounding maxima. The variability time scales range from weeks to months. These phenomena show a strong frequency dependence, in which the variability amplitudes increase with wavelength. During an Intraday Variability (IDV) monitoring project (March 2000), a feature resembling an ESE-like event appeared in the variable light curve of 0954+658, however with a time scale of less than two days. We will discuss this effect and its implications for a better description of the interstellar medium.
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