The LOFAR radio environment | Astronomy & Astrophysics (A&A)

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Volume 549 (January 2013)

A&A, 549 (2013) A11

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Table 3

Observations and their RFI occupancy as reported by automated detection.

Date	Start (UTC)	Duration	Id	Target	Δν (kHz)	Δt (s)	RFI ¹

LBA observations (frequency range ≈ 30–78 MHz)
2010-11-20	19.33	5 min	L21478	Moon	3.0	1	4.6%
2010-11-20	19.43	6 h	L21479	Moon	3.0	1	10.3%
2011-04-14	19.00	8 h	L25455	Moon	0.76	1	4.3%
2011-10-09	6.50	24 h	L31614	NCP	0.76	1	1.8%

HBA observations (frequency range ≈ 115–163 MHz)
2010-11-21	20.26	5 min	L21480	Moon	3.0	1	5.6%
2010-12-27	0.00	24 h	L22174	NCP	0.76	1	3.2%
2011-03-27	20.00	6 h	L24560	NCP	3.0	2	1.5%
2011-04-01	16.08	6 h	L24837	3C196	3.0	2	2.6%
2011-06-11	11.30	1.30 h	L28322	3C196	3.0	2	6.5%
2011-11-17	18.00	12 h	L35008	NCP	3.0	2	3.6%
2011-12-06	2.36	25 min	L36691	3C196	3.0	2	5.5%
2011-12-06	8.34	25 min	L36692	3C295	3.0	2	8.0%
2011-12-20	7.39	30 min	L39562	3C295	3.0	2	2.5%
2012-01-26	2.00	5.30 h	L43786	3C295	3.0	2	3.6%

Notes. The bold entries are the surveys analysed in this article.

⁽¹⁾

RFI occupancy as found by automated detection. For some targets, this is too high because of the band-edge issues that are discussed in the text, leading to approximately a 1−2% increase in 3-kHz channel observations.

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