"Wind" spacecraft and ground observation of solar and near earth high-frequency radio burts during strong solar activity at november 4, 2001

Details "Wind" spacecraft and ground observation of solar and near earth high-frequency radio burts during strong solar activity at november 4, 2001 "Wind" spacecraft and ground observation of solar and near earth high-frequency radio burts during strong solar activity at november 4, 2001

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....5446d&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #5446

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Scientific paper

The strong solar flare of X1/3B magnitude on November 4, 2001 is investigated in the radio frequency range along with its affect on near Earth space HF radio noise. The dynamic spectra of solar type II and III radio emission in the range of 20 kHz - 14 MHz from WAVES instrument of the WIND spacecraft reveals that many unresolved solar type III bursts were detected during the solar flare that were probably generated by energetic electrons at the shock front driven by a coronal mass ejection. Simultaneously, the level of radio noise was recorded at frequencies 280, 300, 150 and 500 MHz by ground radio antennae placed 700 km from each other. In spite of differences in the construction of radio receiving channels, the series of bursts were observed at both places during and after the beginning of the flare. Taking into consideration that the flare occurred during night time for both ground observing points, these bursts cannot be interpreted as solar type. The comparative analysis of the fine structure of bursts shows that there were at least two groups of bursts around the flare. The first group was weak and coincided with Ha and X-ray flare as well as with solar II type radio burst according to the WIND RAD2 receiver. The second group, brightly distinguishing above the background noise, occurred 3-4 hours after the flare. The wavelet and cross correlation analyses of radio noise at different frequencies after excluding strong spikes are provided. The obtained experimental data were compared with dynamics of electron and proton fluxes in different energetic ranges for different regions of the space: 1) in interplanetary space using data from the ACE satellite, 2) in the polar cap using "Coronas-F" satellite data, and 3) from geostationary orbit using data from the GOES satellites. Fine structure of the bursts mostly does not coincide at different frequencies suggesting either narrow band emission features or the imposing of local conditions on the radio wave propagation above the ground observing sites. The supposition is made that the source of HF near Earth does not have a long life but emerges sporadically for a short time from a fraction of a second to several 10s of seconds under the influence of external factors.

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