Giant macro-spicule as observed by CDS on SOHO

نویسندگان

  • D. Banerjee
  • E. O’Shea
چکیده

We examine spectral time series of coronal line Mg ix 368 Å and transition region line O v 629 Å, observed with the Coronal Diagnostic Spectrometer (CDS) onboard the SOHO spacecraft. Primarily we were looking for intensity and velocity oscillations in polar plumes, however by chance we detected a giant macro-spicule at the limb and were able to follow its dynamical structure. Blue and red-shifted emission in the O v line indicates that it is probably a rotating twisted magnetic jet. Emission is also detected in the Mg ix 368 Å line, at a temperature of 1 million K. Both Fourier and wavelet transforms have been applied independently to the analysis of the oscillations in order to find the most reliable periods. We report here on the existence of long period oscillations in the polar plumes as observed in the O v 629 Å line. Our observations indicate the presence of compressional waves with periods of 20-25 minutes.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Giant macro - spicule as observed by CDS on

We examine spectral time series of coronal line Mg ix 368 A and transition region line O v 629 A, observed with the Coronal Diagnostic Spectrometer (CDS) onboard the SOHO spacecraft. Primarily we were looking for intensity and velocity oscillations in polar plumes, however by chance we detected a giant macro-spicule at the limb and were able to follow its dynamical structure. Blue and red-shift...

متن کامل

What Goes Up Doesn’t Necessarily Come Down! - Connecting the Dynamics of the Chromosphere and Transition Region with TRACE, Hinode and SUMER

We explore joint observations of the South-East limb made by Hinode, TRACE and SOHO/SUMER on April 12, 2008 as part of the Whole Heliosphere Interval (WHI) Quiet Sun Characterization targeted observing program. During the sequence a large, 10Mm long, macro-spicule was sent upward and crossed the line-of-sight of the SUMER slit, an event that affords us an opportunity to study the coupling of co...

متن کامل

LONG PERIOD OSCILLATIONS IN POLAR PLUMES AS OBSERVED BY CDS ON SoHO

We examine spectral time series of the transition region line O v 629 A, observed with the Coronal Diagnostic Spectrometer (CDS) on the SoHO spacecraft in July 1997. Both Fourier and wavelet transforms have been applied independently to the analysis of plume oscillations in order to nd the most reliable periods. The wavelet analysis allows us to derive the duration as well as the periods of the...

متن کامل

Dynamic Properties of Solar Spicules Observed by Sumer/soho

We present a study the dynamic properties of EUV spicules. The selected data were obtained as time series in polar coronal holes by SUMER/SOHO. The short exposure time and the almost fixed position allow the analysis of the spicule properties such as: occurrence, lifetime, Doppler velocity, etc. Our data reveal that spicules occur repeatedly at the same location with a birth rate of around 0.1/...

متن کامل

ar X iv : a st ro - p h / 05 11 48 7 v 1 1 6 N ov 2 00 5 Multithermal Analysis of a CDS Coronal Loop

The observations from 1998 April 20 taken with the Coronal Diagnostics Spectrometer (CDS) on the Solar and Heliospheric Observatory (SOHO) of a coronal loop on the limb have shown that the plasma was multi-thermal along each line of sight investigated, both before and after background subtraction. The latter result relied on Emission Measure (EM) Loci plots, but in this Letter, we used a forwar...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2000