Recent Flare List (2021-)

List of EOVSA Flares with Spectrogram Data

Pre-2021 Selected Events

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage
2019-04-15	19:31	B3.3	plot data	NA

April 2021

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage
2021-04-17	16:46	B9.0	plot data	Yes
2021-04-19	23:36	M1.0	plot data	No

May 2021

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage
2021-05-05	22:30	B5.0	plot data	Yes
2021-05-07	19:00	M4.0	plot data	Yes
2021-05-08	18:30	C9.0	plot data	Yes
2021-05-09	13:55	C4.0	plot data	Yes
2021-05-17	19:05	B5.0	plot data	Yes
2021-05-21	19:25	C5.0	plot data	Yes
2021-05-22	16:10	C1.0	plot data	Yes
2021-05-22	17:10	M1.0	plot data	Yes
2021-05-22	21:30	M1.4	plot data	Yes
2021-05-22	23:11	C7.0	plot data	Yes
2021-05-23	17:00	C2.0	plot data	Yes
2021-05-27	22:00	C1.0	plot data	No
2021-05-27	23:10	C7.0	plot data	No
2021-05-28	22:30	C9.0	plot data	No

July 2021

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage
2021-07-03	14:27	X1.5	plot data	No
2021-07-06	19:15	C1.1	plot data	No
2021-07-06	20:58	C1.2	plot data	No
2021-07-06	21:49	C1.1	plot data	No
2021-07-09	17:20	C4.7	plot data	No

August 2021

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage
2021-08-20	15:55	C3.0	plot data	Yes
2021-08-20	21:45	C1.4	plot data	Yes
2021-08-21	18:41	B3.9	plot data	Yes
2021-08-21	21:57	B3.9	plot data	Yes
2021-08-21	22:29	B4.7	plot data	Yes
2021-08-26	18:12	C3.0	plot data	Yes
2021-08-26	23:20	C3.9	plot data	Yes
2021-08-27	21:00	C7.3	plot data	Yes
2021-08-29	17:21	C2.9	plot data	Yes (occulted?)
2021-08-30	16:12	C2.0	plot data	Yes (occulted)
2021-08-30	18:23	B7.0	plot data	Yes (occulted)
2021-08-30	20:47	B8.0	plot data	Yes (occulted)
2021-08-31	14:48	B2.5	plot data	No
2021-08-31	19:08	B7.1	plot data	No

September 2021

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage
2021-09-08	17:24	C8.3	plot data	Yes
2021-09-20	all day	low B	plot data plot data plot data	Yes
2021-09-21	20:24	B5.1	plot data	Yes
2021-09-22	20:12	C1.1	plot data	Yes
2021-09-23	15:24	M1.9	plot data	Yes
2021-09-23	20:40	C1.0	plot data	Yes
2021-09-24	16:45	none?	plot data	Yes
2021-09-24	21:16	B2.0	plot data	Yes
2021-09-25	19:15	C1.7	plot data	Yes

October 2021

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage	Comment
2021-10-11	19:21	B2	plot data	Yes
2021-10-12	15:57	B6	plot data	Yes
2021-10-28	15:26	X1	plot data	Yes	Evidence for low band spike emission (~15:28:30 UT)

November 2021

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage
2021-11-01	20:43	C2.1	plot data	Yes
2021-11-01	21:11	C4.0	plot data	Yes
2021-11-01	23:39	C4.5	plot data	Yes
2021-11-03	21:14	C5.2	plot data	Yes

December 2021

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage	Comment
2021-12-12	21:13	C1.2	plot data	Yes
2021-12-14	20:33	C1.6	plot data	Yes
2021-12-31	19:42	C8.1	plot data	Yes	Surprisingly weak in microwaves considering it is a C8 in soft X-rays.

January 2022

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage	Comment
2022-01-18	17:38	M1.2	plot data	Yes
2022-01-28	19:31	C2.8	plot data	Yes
2022-01-28	20:10-20:50	B2-B6	plot data	Yes
2022-01-29	23:00	M1	plot data	Yes	EOVSA took fast-mode data of this event Each row is 2-min of data at 20 ms cadence

February 2022

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage
2022-02-03	20:42	C1.3	plot data	Yes
2022-02-05	17:00	C2.1	plot data	Yes
2022-02-08	21:40	C5.1	plot data	Yes

March 2022

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage	Comment
2022-03-30	17:30	X1.4	plot data	Yes	Interesting oscillations
2022-03-31	18:28	M9.7	plot data	Yes
2022-03-31	19:32	C5	plot data	Yes

April 2022

Although EOVSA observed many interesting events in April, the cooled receiver on the 27-m antenna, essential for phase calibration, was not working from about April 1 - May 7, 2022. The cause of the long outage was that the manlift needed to repair the receiver had a flat tire that required a long leadtime to replace. Any events seen during this period are available in total power only--no imaging is possible.

May 2022

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage	Comment
2022-05-10	13:55	X1.5	plot data	No
2022-05-11	18:35	M2.6	plot data	Yes
2022-05-15	00:01	M2.3	plot data	No
2022-05-17	19:33	C2.0	plot data	No
2022-05-18	22:00	M1.1	plot data	No
2022-05-24	22:30	C5.1	plot data	No
2022-05-25	18:17	M1.3	plot data	No	Two-ribbon flare from spotless region

July 2022

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage	Comment
2022-07-08	20:23	M2.6	plot data	No
2022-07-14	21:45	M2.9	plot data	No
2022-07-15	23:09	C2.9	plot data	No
2022-07-16	21:17	C1.1	plot data	No
2022-07-17	21:37	C4.8	plot data	No
2022-07-31	22:50	C9.3	plot data	No

August 2022

Note: For much of August the array was down due to a planned power outage to install some new power equipment. The event on 2022 Aug. 30 was observed while the array was not yet tuned for delays.

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage	Comment
2022-08-30	17:58	M1.2	plot data	No	The amplitudes are not corrected for bad delays link to total power plot with ~ correct amplitudes

September 2022

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage	Comment
2022-09-12	23:45	M1.8	plot data	No
2022-09-16	15:51	M6.7	plot data	Yes
2022-09-17	20:43	M2.6	plot data	Yes	Weak, occulted event
2022-09-18	22:11	C3.0	plot data	Yes
2022-09-23	18:02	M1.7	plot data	Yes
2022-09-30	16:24	M3.0	plot data	No
2022-09-30	22:41	C3.0	plot data	No	Nice on-disk jet-like event

October 2022

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage	Comment
2022-10-01	18:02	C3	plot data	No
2022-10-01	18:49	C2	plot data	No
2022-10-01	20:09	M5.8	plot data	No
2022-10-02	20:23	X1.1	plot data	No	Very strong radio event >1700 sfu
2022-10-03	20:21	M2	plot data	No
2022-10-10	15:42	C5	plot data	No
2022-10-10	16:12	M2	plot data	No
2022-10-10	23:19	C3	plot data	No	Tiny circular-ribbon flare
2022-10-11	16:35	C3.6	plot data	No
2022-10-11	18:17	C6.1	plot data	No
2022-10-12	16:28	C4.7	plot data	No
2022-10-13	00:10	M1.5	plot data	No

November 2022

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage	Comment
2022-11-12	18:02	C6.5	plot data	Yes	Unusually fast (1-s) rise time

December 2022

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage	Comment
2022-12-09	22:42	C5.0	plot data	Yes	Very spikey, yet strong (and brief) in SXR
2022-12-13	19:48	C1.0	plot data	Yes
2022-12-13	23:17	C3.0	plot data	Yes
2022-12-14	19:09	C3.0	plot data	Yes
2022-12-14	19:33	C5.0	plot data	Yes
2022-12-14	20:55	M2.0	plot data	Yes
2022-12-14	22:06	M3.0	plot data	Yes
2022-12-16	19:06	C9.0	plot data	Yes	VLA C-band data were obtained for this flare
2022-12-17	19:46	M1.0	plot data	Yes	Nice east-limb filament eruption
2022-12-21	20:45	C5.0	plot data	Yes
2022-12-21	22:12	C6.9	plot data	Yes
2022-12-22	22:27	B7.8	plot data	Yes	Intense decimetric emission with weak GS
2022-12-27	16:24	M1.2	plot data	Yes
2022-12-27	20:36	C4.5	plot data	Yes
2022-12-29	18:18	M2.4	plot data	Yes	A nice, long-duration limb flare
2022-12-29	18:18	M2.4	plot data	Yes	Same flare as above, showing long decay
2022-12-30	19:09	C4.0	plot data	Yes	This and the next flare could be considered one event
2022-12-30	19:35	M3.7	plot data	Yes	Really nice on-disk event (flux rope)

January 2023

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage	Comment
2023-01-09	18:46	X2.0	plot data	Yes
2023-01-10	22:47	X1.0	plot data	Yes

February 2023

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage	Comment
2023-02-17	20:03	X2.3	plot data	Yes
2023-02-21	20:12	M5.1	plot data	Yes
2023-02-26	19:17	C2.8	plot data	Yes

March 2023

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage	Comment
2023-03-05	21:35	M5	plot data	Yes
2023-03-08	22:42	M1.4	plot data	Yes
2023-03-18	20:51	B8.6	plot data	Yes	OVRO-LWA data for this event

April 2023

Date	Time (UT)	GOES Class	Spectrogram	STIX Coverage	Comment
2023-04-07	20:37	C2.6	plot data	Yes
2023-04-07	23:34	C5.8	plot data	Yes
2023-04-11	22:38	C5.9	plot data	Yes
2023-04-14	23:26	M1.5	plot data	Yes
2023-04-18	19:12	C1.9	plot data	Yes
2023-04-21	17:57	M1.8	plot data	Yes

Python code to read plotdata file

from __future__ import print_function
def rd_datfile(file):
    ''' Read EOVSA binary spectrogram file and return a dictionary with times 
        in Julian Date, frequencies in GHz, and cross-power data in sfu.
        
        Return Keys:
          'time'     Numpy array of nt times in JD format
          'fghz'     Numpy array of nf frequencies in GHz
          'data'     Numpy array of size [nf, nt] containing cross-power data
          
        Returns empty dictionary ({}) if file size is not compatible with inferred dimensions
    '''
    import struct
    import numpy as np
    def dims(file):
        # Determine time and frequency dimensions (assumes the file has fewer than 10000 times)
        f = open(file,'rb')
        tmp = f.read(83608)  # max 10000 times and 451 frequencies
        f.close()
        nbytes = len(tmp)
        tdat = np.array(struct.unpack(str(int(nbytes/8))+'d',tmp[:nbytes]))
        nt = np.where(tdat < 2400000.)[0]
        nf = np.where(np.logical_or(tdat[nt[0]:] > 18, tdat[nt[0]:] < 1))[0]
        return nt[0], nf[0]
    nt, nf = dims(file)
    f = open(file,'rb')
    tmp = f.read(nt*8)
    times = struct.unpack(str(nt)+'d',tmp)
    tmp = f.read(nf*8)
    fghz = struct.unpack(str(nf)+'d',tmp)
    tmp = f.read()
    f.close()
    if len(tmp) != nf*nt*4:
        print('File size is incorrect for nt=',nt,'and nf=',nf)
        return {}
    data = np.array(struct.unpack(str(nt*nf)+'f',tmp)).reshape(nf,nt)
    return {'time':times, 'fghz':fghz, 'data':data}

IDL code to read plotdata file

function rd_datfile,file
    ; Read EOVSA binary spectrogram file and return a structure with times 
    ; in Julian Date, frequencies in GHz, and cross-power data in sfu.
    ;    
    ; Return tags:
    ;      'time'     Array of nt times in JD format
    ;      'fghz'     Array of nf frequencies in GHz
    ;      'data'     Array of size [nf, nt] containing cross-power data
    ;
    ;    Returns empty dictionary ({}) if file size is not compatible with inferred dimensions
    openr,/get_lun,lun,file
    tmp = dblarr(10451)
    readu,lun,tmp
    free_lun,lun
    nt = (where(tmp lt 2400000.))[0]
    nf = (where(tmp[nt[0]:*] gt 18 or tmp[nt[0]:*] lt 1))[0]
    times = dblarr(nt)
    fghz = dblarr(nf)
    data = fltarr(nt, nf)
    openr,/get_lun,lun,file
    readu,lun,times
    readu,lun,fghz
    readu,lun,data
    free_lun,lun
    data = create_struct('time',times,'fghz',fghz,'data',transpose(data))
    return, data
    end