High Temporal and Spectral Resolution Interferometric Observations of Unusual Solar Radio Bursts
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Author(s)
Oberoi, Divya
Evarts, Eric R.
Rogers, Alan E. E.
Date Issued
October 2009
Journal
Solar Physics
Publisher
Springer
Citation
Oberoi, D., E. R. Evarts, and A. E. E. Rogers. “High Temporal and Spectral Resolution Interferometric Observations of Unusual Solar Radio Bursts.” Solar Physics 260.2 (2009) : 389-400. Copyright © 2009, Springer Science+Business Media
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Author's final manuscript
Abstract
We report very high temporal and spectral resolution interferometric observations
of some unusual solar radio bursts near 1420 MHz. These bursts were observed on 13
September 2005, 22 minutes after the peak of a GOES class X flare from the NOAA
region 10808. Our observations show 11 episodes of narrow-band intermittent emission
within a span of ≈8 s. Each episode shows a heavily frequency-modulated band of emission
with a spectral slope of about −245.5 MHz s−1 [s superscript -1], comprising up to 8 individual blobs of
emission and lasts for 10–15 ms. The blobs themselves have a spectral slope of ≈ 0 MHz
s−1 [s superscript -1], are ≈200–250 kHz wide, appear every ≈400 kHz and last for ≈ 4–5 ms. These
bursts show a brightness temperatures in the range 1012 [10 superscript 12] K, which suggests a coherent
emission mechanism. We believe these are the first high temporal and spectral resolution
interferometric observations of such rapid and narrow bandwidth solar bursts close to 1420
MHz and present an analysis of their temporal and spectral characteristics.
MIT Department
Haystack Observatory
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DOI of Published Version
https://doi.org/10.1007/s11207-009-9459-x
