{"id":6,"date":"2017-01-30T11:48:27","date_gmt":"2017-01-30T10:48:27","guid":{"rendered":"https:\/\/sites.lesia.obspm.fr\/gmi-radio-cme\/?page_id=6"},"modified":"2017-09-11T10:20:34","modified_gmt":"2017-09-11T08:20:34","slug":"2002-03-22","status":"publish","type":"page","link":"https:\/\/sites.lesia.obspm.fr\/gmi-radio-cme\/2002-03-22\/","title":{"rendered":"2002-03-22"},"content":{"rendered":"

22 March 2002 (SS06, -100) MC CMEH10-CMEH11<\/h3>\n

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22 March Episode 1 10:30-11:30 UT:<\/strong> Microwave burst (A) observed by Ondrejov (single frequency at 3 GHz and spectrum in the frequency range 2-4.5 GHz) and at lower frequencies (B) by the NRH (432 MHz and 164 MHz). The burst onset coincides with that of a type III burst group which is followed at 11:05 UT by a type II burst also observed first by the NRH and the DAM, then by WIND\/Waves (11:30-12:40 UT, 14000-500 kHz, exhibiting several branches). This event is associated with CMEh10 (Halo 10:06 V 1750, 1685, 1662 km \u22121 ).<\/p>\n

Episode 2<\/strong> This type II burst disappears abruptly at 12:45 UT, except for one of its lanes which also disappears soon after. This disappearance: a) coincides with the onset of a burst of short duration well detected by the DAM (80-30 MHz) and WIND\/Waves, then followed by a type II burst of short duration, detected by WIND\/Waves (single tone 14000-500 kHz, 13:10-13:35 UT) and by a continuum detected by WIND\/Waves; b) at this time, another CME (CMEh11 12:30:06 P 243, W 120, V 875, 1027, 937 km s\u22121) appears in the same region and below CMEh11. These observations suggest that the disappearance of the first type II burst, followed by the onset of a new one, results from the interaction of the two CMEs. In addition: a) the speed of the second CME increases with its altitude and has an orientation (Position angle 249\u00b0), which is distinct from that of the first one, CMEh11 (Position angle259\u00b0) whose speed conversely decreases; b) the positions of the radio sources are also distinct, one of them being located in the south, at approximately -1.5 S 1.8 W (time interval 12:55-13:00 UT).<\/p>\n

This event shares the following characteristics:<\/em><\/p>\n