SolarFlowsDr. Gabriele Pierantoni (TCD)

Contents

• What is Heliophysics ? • How could workflows help ?• Some examples• What we are doing...

Solar and Helio physics• Solar physics: the study of the Sun. It is

a branch of astrophysics that specializes in exploiting and explaining the detailed measurements that are possible only for our closest star.

• Heliophysics: the study of the system composed of the Sun’s heliosphere and the objects that interact with it.

HELIOphysics • In heliophysics, we are interested in how an event on or

near the solar surface can propagate through the heliosphere and affect a planetary environment

• Searches should identify interesting time intervals based on a combination of event, features, etc. metadata

• There are concerns about the quality and integrity of the metadata and whether it is adequate to support the searches we would like to undertake

Heliophysics• Automated searches are difficult when major events can be

“missed” and searches for long duration events would yield spurious results

Requirements (1 of 4)

Location is important

Effects depend on type of emission

Propagation is influenced by the interplanetary magnetic field for particles

Propagation models are fundamental !

Requirements (2 of 4)

Data and Metadata interactions

From Data to Metadata : extraction of features and events from raw data. This is a potentially computationally intensive process.

From Metadata to Data : find raw data using metadata (catalogues and lists).

Requirements (3 of 4)

Research Community

Research is currently developed by many different communities who need reliable data models and metadata to be able to work together.

Requirements (4 or 4)

• Use of standard web service protocols• Support of looping• Execution of workflows in both a client and a

server environment• Available support and documentation• Platform independence• Support of multiple instances of a service and

automatic fail-over

Heliophysics, the old way.

Heliophysics, the NEW way.

HELIO Service

HELIO Service

HELIO Service

AccessLayer

HELIOAPI

Heliophysics, the NEW way.

HELIO

http://www.helio-vo.eu/services/service_interfaces.php

HELIO

http://helio.i4ds.technik.fhnw.ch/Helio-dev/prototype/explorer

USER Workflows

ADMIN Workflows

Enabling Services

Resources

Resources

Different Workflows in Heliophysics(So far....)

• Integration tests at development time in order to assert consistency between different services.

• Virtual services which provide basic building blocks to be reused in other services.

• The actual science by combining services, user-defined operations and virtual workows into larger workflows.

Test data and services

Tests the integrity of instruments IDs between two HELIO services (ICS and DPAS). It does not require any inputs since it is checking the complete content of the ICS against the the instrument registered in the DPAS.

Virtual Service

This workflow is an example ofa virtual service that combines several service calls. The calls are used to properly handle asynchronous service calls.

Real Science1. Find which SEP events have been

observed at Earth during the time of interest.

2. Propagate the events found backwards to retrieve the time and position in which the particles were accelerated towards Earth.

3. Flare catalogues at the HEC are queried using the times previously calculated

4. Coronal mass ejections and radio shocks are events observed above the solar atmosphere; thus two new queries to the HEC are made using the new time ranges obtained in the previous step.

5. Finally, a summary table is created which links each SEP event to the associated are, CME and radio shock.

Propagation Model 1st prototype

What we’re doing, What we will do

• Customisable Propagation Model

• Validation of Propagation Model through HELIO (and other) services.

• Show and discuss it to the Heliophysics community at the CDAW event in September 2012

• Workflow Interoperability.