Sun Type III/3 Radio Burst
April 30, 2014, 2339 UT



  • Below is SDR# spectrum analyzer display showing the Sun radio emissions from approximately 26.951 MHz to 29.051 MHz.
  • The Sun radio emission is the white blueish noise in the top part of the bottom spectrogram window.
  • Spectrogram top is the current spectrum trace shown in the top window.
  • Spectrogram bottom is the oldest spectrum, approximately 12 seconds after the current spectrum trace at the top.
  • 3 to 4 seconds between spectrogram vertical time stamps
  • The signals on the left side are the Citizens band radio (CB radio) (26.965 MHz to 27.405 MHz).
  • The signals on the right are the 10 meter (28.0 MHz to 29.7 MHz) amateur radio band.


  • UT20140430_2339sun.mov file video
    • Notice the rapid onset and slower decay.
    • Scroll through the video frame by frame to see each spectrum trace.

Sun radio emissions

United States Frequency Allocations

United States Frequency Allocations

The Radio Spectrum, October 2003
National Telecommunications and Information Administration

Observing Information

  • OBS-Time: April 30, 2014, 2339 UT
  • OBS-Location: Camas, WA USA, 16.6 miles East-North-East from the center of Portland, OR, USA

Hardware Equipment

  • Radio: NooElec NESDR Mini SDR & DVB-T USB Stick (R820T) based on the Realtek RTL2832U and the Raphael Micro R820T
  • FM trap is used to remove the strong FM stations from overloading the SDR.
    • Radio Shack FM trap, See the frequency response in the reviews.
  • Antenna: Scanner Ant-Base 30-1300 Mhz by Antennacraft, includes 50 feet of RG-6
  • Laptop: HP G70 NOtebook PC, Pentium Dual Core CPU, T4200 @ 2.00 GHz, 3 GB RAM, 32-bit
  • Data logging to Toshiba 2TB USB hard drive


  • SDR# V1.0.0.1193
    • Less than 26.951 MHz start frequency
    • 28 MHz center frequency
    • More than 29.051 MHz stop frequency
    • 2.4 MHz frequency span
    • 2.4 MHz capture bandwidth
    • ACG off
    • RF Gain 33.8 dB
    • Blackman-Harris 4 FFT window, resolution 32,768
  • Python 2.7.6 and Python Imaging Library (PIL V1.1.7) script taking screen captures every 5 seconds
  • Ridiculously Simple NTP Client by Wolfgang "Wolf" DL4YHF for time keeping
  • Microsoft Windows Vista Home Premium, Service Pack 2

Radio JOVE Data Archive Calendar

Verifying Solar Burst

NOAA/National Weather Service
National Centers for Environmental Prediction
Space Weather Prediction Center
Solar Event Reports (Edited Events)

  • Solar burst began at 2339 UT and ended at 2341 UT
  • Reporting observatory CUL: Culgoora, Australia
  • Q = Quality: C = Corrected report
  • Type RSP: Sweep-frequency radio burst
  • Frequency: 18 MHz to 150 MHz
  • Particulars: type III burst of major intensity 3
    • Type III: Fast drift burst
    • 3 is major intensity rating

:Product: 20140430events.txt
:Created: 2014 May 01 0302 UT
:Date: 2014 04 30
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
# Please send comments and suggestions to SWPC.Webmaster@noaa.gov 
# Missing data: ////
# Updated every 30 minutes.
#                            Edited Events for 2014 Apr 30
#Event    Begin    Max       End  Obs  Q  Type  Loc/Frq   Particulars       Reg#
5680 +     2339   ////      2341  CUL  C   RSP  018-150   III/3  


  • NASA WIND-WAVES: The Radio and Plasma Wave Investigation on the WIND Spacecraft
  • NASA STEREO (Solar TErrestrial RElations Observatory)