Radio and EUV Measurements of the Equatorial Coronal Hole of February 25, 1999

Details Radio and EUV Measurements of the Equatorial Coronal Hole of February 25, 1999 Radio and EUV Measurements of the Equatorial Coronal Hole of February 25, 1999

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..346..245s&link_type=abstract

Large-scale Structures and their Role in Solar Activity ASP Conference Series, Vol. 346, Proceedings of the Conference held 18-2

Computer Science

2

Scientific paper

We present here the observations of the equatorial coronal hole made at 109 MHz on February 25, 1999 with the Gauribidanur Radioheliograph. The brightness temperature of this coronal hole is about 1.7 × 105 K. We compare our observations with EUV measurements of EIT onboard SOHO. Ray-tracing calculations show that the observed brightness temperature of this coronal hole can be due a decrement in density by factor of 4 compared to the Newkirk's density model.

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