NDLI: Oscillation Maps in the Broadband Radio Spectrum of the 1 August 2010 Event

Content Provider	Springer Nature Link
Author	Karlický, M. Rybák, J.
Copyright Year	2016
Abstract	We search for indications of waves in the 25 – 2000 MHz radio spectrum of the 1 August 2010 event (SOL2010-08-01T08:57:00L075C013), where fast propagating waves in the solar corona with periods of 181, 69, and 40 seconds were detected in UV observations. Using the wavelet technique, we construct a new type of oscillation map for selected periods in the whole domain of the radio spectrum. While an oscillation with a period of 181 seconds was recognized in the whole 25 – 2000 MHz radio spectrum, oscillations with periods of 69 and 40 seconds were only confirmed in the 250 – 870 MHz frequency range. In the 800 – 2000 MHz range we found periods of 50 and 80 seconds. Moreover, in the 250 – 870 MHz frequency range, an oscillation with a period of about 420 seconds was detected. We also made maps of phases of the 181-second oscillations in order to analyze their frequency drift. At the beginning of the radio event, the phase of the 181-second oscillation in the 2000 – 500 MHz frequency range drifts toward lower frequencies. On the other hand, we found that the phase is nearly synchronous at frequencies 25 – 500 MHz. While the phase drift at higher frequencies can be interpreted as being caused by the UV wave, the synchronization of the phase on lower frequencies is explained by the fast electron beams, whose acceleration is modulated by the UV wave. Owing to this modulation, the electron beams are accelerated with the period of the UV wave (181 seconds). These beams propagate upward through the solar corona and generate the 25 – 500 MHz radio emission with the 181-second period. The 25 – 500 MHz radio emission, which corresponds to a large interval of heights in the solar corona, is nearly synchronous because of the high beam velocity ( ${\approx}\,\mathrm{c}/3$ , where c is the light speed).
Starting Page	1
Ending Page	17
Page Count	17
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	292
Issue Number	1
e-ISSN	1573093X
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-12-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sun: flares Sun: radio radiation Sun: oscillations Astrophysics and Astroparticles Atmospheric Sciences Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics)
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

Simultaneous Longitudinal and Transverse Oscillations in an Active-Region Filament

Turnover Frequency in Solar Microwave Bursts with an Extremely Flat Optically Thin Spectrum

Estimating Solar Flux Density at Low Radio Frequencies Using a Sky Brightness Model

Acoustic and Slow Sausage Oscillations in the Stratified Solar Photosphere: Hinode Observations and Phase Relationships

Magnetoacoustic Wave Trains in the 11 July 2005 Radio Event with Fiber Bursts

Transverse Oscillations in a Coronal Loop Triggered by a Jet

Quasi-periodic Pulsations in Solar and Stellar Flares: An Overview of Recent Results (Invited Review)

Flux-Rope Twist in Eruptive Flares and CMEs: Due to Zipper and Main-Phase Reconnection

The Brightness Temperature of the Quiet Solar Chromosphere at 2.6 mm

Oscillation Maps in the Broadband Radio Spectrum of the 1 August 2010 Event

Similar Documents

Simultaneous Longitudinal and Transverse Oscillations in an Active-Region Filament

Turnover Frequency in Solar Microwave Bursts with an Extremely Flat Optically Thin Spectrum

Estimating Solar Flux Density at Low Radio Frequencies Using a Sky Brightness Model

Acoustic and Slow Sausage Oscillations in the Stratified Solar Photosphere: Hinode Observations and Phase Relationships

Magnetoacoustic Wave Trains in the 11 July 2005 Radio Event with Fiber Bursts

Transverse Oscillations in a Coronal Loop Triggered by a Jet

Quasi-periodic Pulsations in Solar and Stellar Flares: An Overview of Recent Results (Invited Review)

Flux-Rope Twist in Eruptive Flares and CMEs: Due to Zipper and Main-Phase Reconnection

The Brightness Temperature of the Quiet Solar Chromosphere at 2.6 mm

Oscillation Maps in the Broadband Radio Spectrum of the 1 August 2010 Event