NDLI: Seismology of the solar atmosphere

Content Provider	Springer Nature Link
Author	Finsterle, Wolfgang Jefferies, Stuart M. Cacciani, Alessandro Rapex, Paolo Giebink, Cynthia Kx, Allister DiMarti, Vincenzo
Copyright Year	2004
Abstract	We describe a new instrument for seismically probing the properties of the Sun's lower atmosphere, and present some first results from an observational campaign carried out at the geographic South Pole during the austral summer of 2002/2003. A preliminary analysis of the data (simultaneous, high-cadence observations of the velocity signals from the photosphere and low chromosphere) shows that the well-known suppression of acoustic power in regions of strong magnetic field, and enhancement of high-frequency power around active regions (acoustic halos), are both consistent with a spreading out of the magnetic field lines with increasing height in the atmosphere. The data have also revealed some unexpected wave behavior. First, evanescent-like waves are found at frequencies substantially above the acoustic cut-off frequency in regions of intermediate magnetic field. Second, upward- and downward-propagating waves are detected in areas of strong magnetic field such as sunspots and plage: even at frequencies below the acoustic cut-off frequency. Third, the wave behavior in regions of strong magnetic field can change over periods of a few hours from propagating to evanescent. While we have no concrete explanation for the first two results, the latter result opens up the question of whether sound waves are involved in short-term events such as flares or CME's.
Starting Page	317
Ending Page	331
Page Count	15
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	220
Issue Number	2
e-ISSN	1573093X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy, Astrophysics and Cosmology Astronomy Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

The Lower Solar Atmosphere Rapporteur Paper II

HALL-MHD turbulence in the Solar atmosphere

Effects of Particle Beams in the Solar Atmosphere

Magnetohydrodynamic Waves and Seismology of the Solar Atmosphere

Velocity Shear Induced Phenomena in Solar Atmosphere

FIP Effect in the Solar Upper Atmosphere: Spectroscopic Results

Composition Aspects of the Upper Solar Atmosphere Rapporteur Paper III

Turbulence In The Solar Atmosphere: Manifestations And Diagnostics Via Solar Image Processing

Radio Versus EUV/X-Ray Observations of the Solar Atmosphere

Seismology of the solar atmosphere

Similar Documents

The Lower Solar Atmosphere Rapporteur Paper II

HALL-MHD turbulence in the Solar atmosphere

Effects of Particle Beams in the Solar Atmosphere

Magnetohydrodynamic Waves and Seismology of the Solar Atmosphere

Velocity Shear Induced Phenomena in Solar Atmosphere

FIP Effect in the Solar Upper Atmosphere: Spectroscopic Results

Composition Aspects of the Upper Solar Atmosphere Rapporteur Paper III

Turbulence In The Solar Atmosphere: Manifestations And Diagnostics Via Solar Image Processing

Radio Versus EUV/X-Ray Observations of the Solar Atmosphere

Seismology of the solar atmosphere