J/ApJ/893/78 Streamer wave events from STEREO observations (Decraemer+, 2020)
Properties of streamer wave events observed during the STEREO era.
Decraemer B., Zhukov A.N., Van Doorsselaere T.
<Astrophys. J., 893, 78-78 (2020)>
=2020ApJ...893...78D 2020ApJ...893...78D (SIMBAD/NED BibCode)
ADC_Keywords: Sun
Keywords: Solar coronal streamers; Solar corona; Solar coronal waves
Abstract:
Transverse waves are sometimes observed in solar helmet streamers,
typically after the passage of a coronal mass ejection (CME). The
CME-driven shock wave moves the streamer sideways, and a decaying
oscillation of the streamer is observed after the CME passage.
Previous works generally reported observations of streamer
oscillations taken from a single vantage point (typically the Solar
and Heliospheric Observatory (SOHO) spacecraft). We conduct a data
survey searching for streamer wave events observed by the COR2
coronagraphs on board the STEREO spacecraft. For the first time, we
report observations of streamer wave events from multiple vantage
points by using the COR2 instrument on both STEREO A and B, as well as
the SOHO/LASCO C2+C3 coronagraphs. We investigate the properties of
streamer waves by comparing the different events and performing a
statistical analysis. Common observational features give us additional
insight on the physical nature of streamer wave events. The most
important conclusion is that there appears to be no relation between
the speed of the CME and the phase speed of the resulting streamer
wave, indicating that the streamer wave speed is determined by the
physical properties of the streamer rather than the properties of the
CME. This result makes streamer wave events excellent candidates for
coronal seismology studies. From a comparison between the measured
phase speeds and the phase speeds calculated from the measured periods
and wavelengths, we could determine that the speed of the postshock
solar wind flow in our streamers is around 300km/s.
Description:
In this paper, we present a data survey searching for the streamer
wave events observed by the COR2 coronagraphs aboard the twin
spacecraft of the Solar Terrestrial Relations Observatory (STEREO)
mission (Kaiser+ 2008SSRv..136....5K 2008SSRv..136....5K).
We first examined the STEREO A and B COR2 data for streamer
oscillation events from the start of the STEREO mission in 2007
January until the end of 2017 September. Then, we checked whether the
streamer wave was also observed in the data taken by LASCO C2 and C3
on board the Solar and Heliospheric Observatory (SOHO) spacecraft.
See Section 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 80 22 Summary of the physical parameters measured
for the 22 streamer wave events identified
with STEREO/COR2
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See also:
J/A+A/422/337 : Solar EUV Post-Eruptive Arcades (Tripathi+, 2004)
J/A+A/440/373 : Earthbound interplanetary shocks (Howard+, 2005)
J/ApJ/709/1238 : Solar Coronal Mass Ejection (Yeates+, 2010)
J/ApJ/721/901 : Solar quiescent filament channels (Su+, 2010)
J/ApJ/831/105 : Global energetics of solar flares. IV. CME (Aschwanden, 2016)
J/MNRAS/456/1542 : Predicting CMEs transit times (Sudar+, 2016)
J/ApJ/891/54 : Solar flares & associated CME speeds & widths (Ling+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Event [1/22] Event number
4- 7 I4 yr Obs.Y [2008/2017] Year of Event starting date
9- 10 I2 "month" Obs.M Month of Event starting date
12- 13 I2 d Obs.D Day of Event starting date
15- 16 I2 h Obs.h Hour of Event starting time, UT
18- 19 I2 min Obs.m Minute of Event starting time, UT
21- 22 I2 s Obs.s Second of Event starting time, UT
24- 39 A16 --- Inst Observing coronagraph(s) (1)
41- 43 I3 deg PA [0/325] Position angle, solar north at 0
45- 47 I3 min Per [120/480] Oscillation period
49- 52 F4.2 Rsun lambda [2.86/8.55] Oscillation wavelength
54- 56 I3 km/s Speed [360/740] Phase Speed
58- 59 I2 h CME.h Hour of CME starting time, UT
61- 62 I2 min CME.m Minute of CME starting time, UT
64- 65 I2 s CME.s Second of CME starting time, UT
67- 69 I3 deg PA-CME [37/330] Central position angle of CME
71- 73 I3 deg Width-CME [21/360] Width of CME
75- 80 I6 km/s Speed-CME [210/2030] Speed of CME
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Note (1): If multiple coronagraphs are mentioned in the "Inst" column, the first
one mentioned is the main coronagraph. The main coronagraph is the
instrument from which the images were used to make the measurements.
Separation angle in degress in () if multiple.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 08-Sep-2021