Kilometre-wave radio observations of solar type III bursts by ULYSSES compared with decametre-wave observations from the Earth.

Details Kilometre-wave radio observations of solar type III bursts by ULYSSES compared with decametre-wave observations from the Earth. Kilometre-wave radio observations of solar type III bursts by ULYSSES compared with decametre-wave observations from the Earth.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...316..413b&link_type=abstract

Astronomy and Astrophysics, v.316, p.413-424

Astronomy and Astrophysics

Astrophysics

1

Sun: Radio Radiation, Corona

Scientific paper

Observations of solar type III bursts, made at kilometric frequencies by the radio receiver of the Ulysses Unified Radio and Plasma Wave (URAP) investigation, are compared with simultaneous observations, made at decametric frequencies at the Nancay Radio Astronomy Station of the Paris-Meudon Observatory, during the period following the spacecraft encounter with Jupiter until the south solar polar pass. Of the events suitable for study, 57 can be identified in both frequency bands having delay times consistent with prediction based upon geometry and upon the frequency drift between the lowest frequency observed on the ground (25MHz) and the highest frequency observed by URAP (940kHz). The good agreement between calculated and measured delay times suggests that the large delay anomalies, reported by Steinberg et al. (1984) sometimes to be in excess of 8 minutes in duration, may be confined to frequencies below the 500kHz limit studied by these authors and not detectable at 940kHz with the time resolution of the URAP receiver obtained in this study. There are cases when bursts recorded at Ulysses are not seen at Nancay. This may just be due to the source at 25MHz being beyond the solar limb and so obscured from the Earth. There are other cases, however, when bursts recorded at the Earth are not seen at Ulysses. Such cases do not appear to be correlated with either the Earth-Sun-Ulysses (ESU) angle or with the heliographic latitude of the spacecraft. As the source region at 940kHz is large and at a considerable distance from the Sun, some part of it will usually be visible from the spacecraft no matter what the relative positions of the Sun, the source and Ulysses may be; this suggests either that there may sometimes be a low frequency cutoff, inherent to the burst itself somewhere between 940kHz and 25MHz, or else that the emission has somehow been occulted. Representative examples are presented and discussed.

Affiliated with

Also associated with

No associations

Rating

Kilometre-wave radio observations of solar type III bursts by ULYSSES compared with decametre-wave observations from the Earth. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Kilometre-wave radio observations of solar type III bursts by ULYSSES compared with decametre-wave observations from the Earth., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Kilometre-wave radio observations of solar type III bursts by ULYSSES compared with decametre-wave observations from the Earth. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-810101